Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued expenses Total Accrued Professional Fees, Current Legal and accounting fees Accrued Research and Development Costs and Other Accrued Research and Development Costs and Other Accrued research and development costs and other Additional Paid in Capital Additional paid-in capital Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Aggregate Offering Price Aggregate Offering Price Aggregate offering price Amendment Flag Amendment Flag Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Dilutive shares not included in calculation Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Arrangements and Non-arrangement Transactions [Domain] Arrangements and Non-arrangement Transactions [Domain] Assets Total assets Assets [Abstract] ASSETS Assets, Current Total current assets Assets, Current [Abstract] Current assets: Award Type [Axis] Award Type [Axis] Basis of Accounting [Text Block] Basis of Presentation Basis of Presentation [Line Items] Basis of Presentation [Line Items] Basis of Presentation [Line Items] Basis of Presentation [Table] Basis of Presentation [Table] Basis of Presentation [Table] Cash and Cash Equivalents, at Carrying Value CASH AND CASH EQUIVALENTS, END OF PERIOD CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD Cash and cash equivalents Unrestricted cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) NET DECREASE IN CASH AND CASH EQUIVALENTS Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] NONCASH FINANCING ACTIVITIES: Class of Stock [Domain] Class of Stock [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Commissions as Percentage of Gross Offering Proceeds Commissions as Percentage of Gross Offering Proceeds Commission to sales agent as a percentage of gross proceeds Commitment And Contingencies [Line Items] Commitment And Contingencies [Line Items] Commitment And Contingencies [Line Items] Commitment And Contingencies [Table] Commitment And Contingencies [Table] Commitment And Contingencies [Table] Commitments and Contingencies Commitments and contingencies (Note 8) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Common Stock, Par or Stated Value Per Share Common stock, par value Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, issued Common Stock, Shares, Outstanding Common stock, outstanding Common Stock, Value, Issued Common stock, $0.001 par value; 50,000,000 shares authorized at June 30, 2016 and December 31, 2015, 29,280,653 and 28,825,033 issued and outstanding at June 30, 2016 and December 31, 2015, respectively Counterparty Name [Axis] Counterparty Name [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Depreciation, Depletion and Amortization Depreciation and amortization Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Dividends Payable, Current Accrued dividends payable Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Information [Line Items] Document Information [Line Items] Document Information [Table] Document Information [Table] Document Period End Date Document Period End Date Document Type Document Type Earnings Per Share [Abstract] Earnings Per Share [Abstract] Earnings Per Share, Basic and Diluted Net loss per common share - basic and diluted Earnings Per Share [Text Block] Loss Per Share Employee-related Liabilities, Current Accrued compensation Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Unrecognized compensation cost, recognition period Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Non-cash stock-based compensation expense to be recognized Employee Stock Option [Member] Stock Options Entity Central Index Key Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity [Domain] Entity [Domain] Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Equity [Abstract] Equity [Abstract] Equity Component [Domain] Equity Component [Domain] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Text Block] Fair Value of Financial Instruments Fair Value Of Asset Contributed To Joint Venture Fair Value Of Asset Contributed To Joint Venture Estimated fair value of the IPR&D Contributed by SBH Financial Support for Nonconsolidated Legal Entity [Abstract] Financial Support for Nonconsolidated Legal Entity [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Galectin Sciences, LLC [Member] Galectin Sciences, LLC [Member] Galectin Sciences, LLC General and Administrative Expense General and administrative General and Administrative Expense [Member] General and administrative Income Statement [Abstract] Income Statement [Abstract] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued expenses Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets In Process Research and Development [Member] In Process Research and Development Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Investment Income, Interest Interest income Investments in and Advances to Affiliates [Line Items] Investments in and Advances to Affiliates [Line Items] Investments in and Advances to Affiliates, Schedule of Investments [Text Block] Galectin Sciences LLC Investments in and Advances to Affiliates [Table] Investments in and Advances to Affiliates [Table] Legal Entity [Axis] Legal Entity [Axis] Liabilities Total liabilities Liabilities and Equity Total liabilities, redeemable convertible preferred stock and stockholders' equity Liabilities and Equity [Abstract] LIABILITIES, REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY Liabilities, Current Total current liabilities Liabilities, Current [Abstract] Current liabilities: Loss Contingency, New Claims Filed, Number Number of putative class action complaints filed Noncontrolling Interest, Ownership Percentage by Parent Equity Method Investment, Ownership Percentage Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Income (Loss) Attributable to Parent Net loss Net loss Net Income (Loss) Available to Common Stockholders, Basic Net loss applicable to common stockholders New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Recent Account Pronouncements Non Employee Board Of Directors One [Member] Non Employee Board Of Directors One [Member] Non Employees Seven Board Of Directors Non Employee Board Of Directors Two [Member] Non Employee Board Of Directors Two [Member] Non Employees Two Board Of Directors Nonoperating Income (Expense) Total other income (expense) Nonoperating Income (Expense) [Abstract] Other income (expense): Operating Expenses Total operating expenses Operating Expenses [Abstract] Operating expenses: Operating Income (Loss) Total operating loss Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Payables and Accruals [Abstract] Payables and Accruals [Abstract] Payments to Acquire Businesses and Interest in Affiliates Subsequent capital contribution Payments to Acquire Equity Method Investments Equity method investment in Galectin Sciences LLC Preferred Stock, Accretion of Redemption Discount Preferred stock accretion Preferred Stock Dividends, Income Statement Impact Preferred stock dividends Preferred Stock, Liquidation Preference, Value Series A 12% convertible preferred stock, liquidation value Preferred Stock, Shares Authorized Series A 12% convertible preferred stock, shares authorized Preferred Stock, Shares Issued Series A 12% convertible preferred stock, issued Preferred Stock, Shares Outstanding Series A 12% convertible preferred stock, outstanding Preferred Stock, Value, Issued Series A 12% convertible preferred stock; 5,000,000 shares authorized, 1,377,500 issued and outstanding at June 30, 2016 and December 31, 2015, liquidation value $1,377,500 at June 30, 2016 Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Proceeds from Issuance of Common Stock Net proceeds from issuance of common stock Net proceeds from issuance of common stock and warrants Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount Convertible preferred stock, value Redeemable Noncontrolling Interest, Equity, Preferred, Redemption Value Convertible preferred stock, redemption value Counterparty Name [Domain] Counterparty Name [Domain] Research and Development Expense Research and development Research and Development Expense [Member] Research and development Restricted Stock [Member] Restricted Stock Retained Earnings (Accumulated Deficit) Retained deficit SBH Sciences, Inc [Member] SBH Sciences, Inc [Member] SBH Sciences, Inc Schedule of Accrued Liabilities [Line Items] Schedule of Accrued Liabilities [Line Items] Schedule of Accrued Liabilities [Line Items] Schedule of Accrued Liabilities [Table] Schedule of Accrued Liabilities [Table] Schedule of Accrued Liabilities [Table] Schedule of Accrued Liabilities [Table Text Block] Accrued Expenses Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Dilutive Shares Which Could Exist Pursuant to Exercise of Outstanding Stock Instruments and Which were not Included in Calculation Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Stock-Based Compensation Expense Related to Common Stock Options, Common Stock, Restricted Common Stock and Common Stock Warrants Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Summary of Restricted Stock Grant Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of Stock Option Activity Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Weighted Average Assumptions Used to Determine Fair Value of Options Granted Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Common Stock Warrant Activity Series B-1 Preferred Stock Series B1 Preferred Stock [Member] Series B-1 12% redeemable convertible preferred stock Series B2 Preferred Stock Series B2 Preferred Stock [Member] Series B-2 12% redeemable convertible preferred stock Series C Preferred Stock [Member] Series C super dividend convertible preferred stock Share-based Compensation Stock-based compensation expense Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Options vesting period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercises in Period, Weighted Average Exercise Price Exercised Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeited/cancelled Options forfeited/cancelled Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures in Period, Weighted Average Exercise Price Forfeited/cancelled Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Granted Restricted stock awards granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Exercise Price Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Ending Balance Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Exercise Price Outstanding, June 30, 2016 Outstanding, December 31, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Exercised Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price [Abstract] Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Weighted Average Exercise Price [Abstract] Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected dividend rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected life of the options Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected volatility of the underlying stock Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised Exercised Share Based Compensation Arrangement By Share Based Payment Award Number Of Non Employee Directors Granted Shares. Share Based Compensation Arrangement By Share Based Payment Award Number Of Non Employee Directors Granted Shares Number of non-employee directors Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options forfeited/cancelled Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Granted Number of options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted-average grant-date fair values of options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Unvested option Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Ending Balance Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Ending Balance Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Number of options vested Equity Award [Domain] Equity Award [Domain] Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Options forfeited/cancelled Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Granted Share Based Compensation, Cost Recognition Date Latest. Share Based Compensation Cost Recognition Date Latest Share based compensation, cliff vest in full date Class of Stock [Axis] Class of Stock [Axis] Equity Components [Axis] Equity Components [Axis] Statement [Line Items] Statement [Line Items] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Stock Compensation Plan [Member] Contingently Issuable Shares Stockholders' Equity Attributable to Parent Total stockholders' equity Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Stockholders' Equity Note Disclosure [Text Block] Common Stock Stock Issued During Period, Shares, New Issues Shares of common stock issued Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised Stock Warrants Stock Warrants Text Block Common Stock Warrants