Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Notes Loans And Financing Receivable By Receivable Type [Axis] Receivable Type [Axis] Accounts Payable Current Accounts payable Accounts Receivable Net Current Accounts receivable Accrued Liabilities Current Accrued expenses Total additional square footage of leased office space Additional Leased Office Space Area of leased office space Additional Office Space Additional Office Space Additional office space Additional Paid In Capital Additional paid-in capital Adjustments To Additional Paid In Capital Warrant Issued Warrants reclassified to 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: Allocated Share Based Compensation Expense Total employee stock-based compensation recorded as operating expenses Amended Agreement [Member] Amended Agreement [Member] Amendment March 2013 [Member] Amendment Flag Amendment Flag Amendment One [Member] Amendment One [Member] Amendment April 2013 [Member] Assets Total assets Assets [Abstract] Assets Assets Current Total current assets Assets Current [Abstract] Current Assets Award Type [Axis] Award Type [Axis] Capital Lease Obligations Current Capital lease obligation Capital Lease Obligations Noncurrent Capital lease obligation, net of current portion Cash And Cash Equivalents At Carrying Value Cash and Cash Equivalents at End of Period Cash and Cash Equivalents at Beginning of Period Cash and cash equivalents Cash and cash equivalents maturity period. Cash And Cash Equivalents Maturity Period Maturity of highly liquid investment Cash And Cash Equivalents Period Increase Decrease Net Decrease in Cash and Cash Equivalents Cash And Cash Equivalents Policy [Text Block] Cash and Cash Equivalents Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Restricted Cash Cashless exercise for issuance of common stock. Cashless Exercise For Issuance Of Common Stock Cashless exercise for issuance of common stock Class Of Stock [Line Items] Class of Stock [Line Items] Class Of Warrant Or Right Exercise Price Of Warrants Or Rights Warrants exercisable price, per share Class of warrant or right life. Class Of Warrant Or Right Life Life of warrants Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights Purchase shares of common stock for issued warrants Class of warrant or right number of warrants exercised. Class Of Warrant Or Right Number Of Warrants Exercised Warrants exercised Class Of Warrant Or Right Outstanding Warrants to purchase common stock Class of warrant or right reclassification from liability instruments to equity instruments. Class Of Warrant Or Right Reclassification From Liability Instruments To Equity Instruments Reclassification of warrant Class of warrant or right exercised. Class Of Warrants Or Right Exercised Warrants liability Commitments And Contingencies Commitments and Contingencies (Note 4) Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments Disclosure [Text Block] Commitments and Contingencies Common Stock Capital Shares Reserved For Future Issuance Common stock reserved for future issuance Common stock capital shares reserved for future issuance. Common Stock Capital Shares Reserved For Future Issuance Table [Text Block] Common Stock Reserved for Future Issuance Common Stock Par Or Stated Value Per Share Common stock, par value Common Stock Shares Authorized Common stock, shares authorized Shares authorized under shelf registration statement Common Stock Shares Issued Common stock, shares issued Issuance of common stock Common Stock Shares Outstanding Common stock, shares outstanding Common Stock Value Common stock, $0.001 par value; 150,000,000 shares authorized, 78,282,460 and 78,113,639 shares issued and outstanding at June 30, 2014 and March 31, 2014, respectively Comprehensive Income Policy Policy [Text Block] Comprehensive Income (Loss) Concentration Risk Disclosure [Text Block] Concentrations Consultant [Member] Consultant [Member] Consultants [Member] Cost Of Services Amortization Amortization of warrants issued for services Current Fiscal Year End Date Current Fiscal Year End Date Deduction in warrant liability. Deduction In Warrant Liability Warrant liability reduced Deferred Revenue Current Deferred revenue Deferred revenue related to collaborative research programs Deferred Revenue Noncurrent Deferred revenue, net of current portion Depreciation Depletion And Amortization Depreciation and amortization Depreciation Depletion And Amortization Policy [Text Block] Fixed Assets and Depreciation Derivative By Nature [Axis] Derivative, by Nature [Axis] Derivative Financial Instruments Liabilities [Member] Warrant Derivative Liability [Member] Derivative Instrument Detail [Abstract] Derivative Instrument Detail [Abstract] Derivative Instruments And Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments And Hedging Activities Disclosure [Text Block] Derivative Liability Derivative Liabilities Current Warrant Derivative Liability, Ending balance Warrant Derivative Liability, Beginning balance Warrant liabilities Warrant liability Derivative [Line Items] Derivative [Line Items] Derivative Name [Domain] Derivative, Name [Domain] Derivatives Policy [Text Block] Derivative Financial Instruments Derivative [Table] Derivative [Table] Development Stage Enterprise Deficit Accumulated During Development Stage Accumulated deficit Accumulated deficit Dilutive Securities Dilutive effect Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Document and entity information. 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 Period End Date Document Period End Date Document Type Document Type Earnings Per Share Basic And Diluted Net loss per common share-basic and diluted Earnings Per Share Policy [Text Block] Net Loss per Share Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition 1 Total unrecognized compensation cost related, weighted average period Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options Unrecognized restricted stock-based compensation expense Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Total unrecognized compensation cost related to unvested stock option grants Employee Stock Option [Member] Stock options [Member] Entity Central Index Key Entity Central Index Key Entity Common Stock Shares Outstanding Entity Common Stock, Shares Outstanding Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Equity [Abstract] Equity [Abstract] Equity Component [Domain] Equity Component [Domain] Equity Distribution Agreement [Member] Equity Distribution Agreement [Member] Equity Distribution Agreement [Member] Equity Fair Value Adjustment Estimated fair value of warrants Equity incentive plan. Equity Incentive Plan Two Thousand Eight [Member] Equity Incentive Plan 2008 [Member] Equity incentive plan two thousand twelve. Equity Incentive Plan Two Thousand Twelve [Member] Equity Incentive Plan 2012 [Member] Expense Related To Distribution Or Servicing And Underwriting Fees Underwriting discounts and commissions and other offering expenses Fair Value Adjustment Of Warrants Change in fair value of warrant liabilities Adjustments to estimated fair value Change in fair value of the derivative liabilities increase and (decrease) Change in fair value of warrant liabilities Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Table] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). Fair Value Assumption Expected Dividend Rate Dividend yield Fair Value Assumptions Exercise Price Exercise price per share Fair Value Assumptions Expected Term Remaining expected term of underlying securities (years) Fair Value Assumptions Expected Volatility Rate Expected volatility Fair Value Assumptions Risk Free Interest Rate Risk-free interest rate Fair Value By Fair Value Hierarchy Level [Axis] Fair Value, Hierarchy [Axis] Fair Value By Liability Class [Axis] Liability Class [Axis] Fair Value By Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fair Value Inputs Level 1 [Member] Quoted Prices in Active Markets (Level 1) [Member] Fair Value Inputs Level 2 [Member] Significant Other Observable Inputs (Level 2) [Member] Fair Value Inputs Level 3 [Member] Significant Other Unobservable Inputs (Level 3) [Member] Fair Value Liabilities Measured On Recurring Basis [Text Block] Estimated Fair Values of Liabilities Measured on Recurring Basis Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Liability Class [Domain] Fair Value by Liability Class [Domain] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Activity for Liabilities Measured at Estimated Fair Value Using Unobservable Inputs Fair Value Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value Measurement Policy Policy [Text Block] Fair Value Measurement Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value Measurements Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Issues Issuances Fair Value Of Financial Instruments Policy Financial Instruments Gain Loss On Disposition Of Assets Loss on disposal of fixed assets Loss on disposal of fixed assets General And Administrative Expense [Member] General and administrative expense [Member] Impairment Of Long Lived Assets Held For Use Impairment of long-lived assets Impairment Or Disposal Of Long Lived Assets Policy [Text Block] Impairment of Long-Lived Assets Income Statement [Abstract] Income Statement [Abstract] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Income Taxes Paid Income Taxes Income Tax Policy [Text Block] Income Taxes Increase Decrease In Accounts Payable Accounts payable Increase Decrease In Accounts Receivable Accounts receivable Increase Decrease In Accrued Liabilities Accrued expenses Increase decrease in cash deposits released from restriction. Increase Decrease In Cash Deposits Released From Restriction Deposits released from restriction Increase Decrease In Deferred Revenue Deferred revenue Increase decrease in grants receivable. Increase Decrease In Grants Receivable Grants receivable Increase Decrease In Inventories Inventory Increase Decrease In Operating Capital [Abstract] Increase (decrease) in cash resulting from changes in: Increase Decrease In Prepaid Deferred Expense And Other Assets Prepaid expenses and other assets Increased Office Space Headquarters Increased Office Space Headquarters Increased office space size Interest Expense Interest expense Interest expense Interest Paid Interest Inventory Net Inventory Inventory Policy [Text Block] Inventory Inventory Raw Materials Net Of Reserves Inventory of raw materials, net of reserves Inventory Valuation Reserves Obsolete inventory reserve Investment Income Interest Interest income Lease Amendment Effective Date Lease Amendment Effective Date Expansion premises commencement date Lease And Rental Expense Rent expense Lease Expiration Date 1 Lease expiration date Lease term with an option to extend the lease at the end of the lease term. Lease Term With Option To Extend Lease term with option to extend Liabilities Total liabilities Liabilities And Stockholders Equity Total Liabilities and Stockholders' Equity Liabilities And Stockholders Equity [Abstract] Liabilities and Stockholders' Equity Liabilities Current Total current liabilities Liabilities Current [Abstract] Current Liabilities Liquidity Disclosure [Text Block] Liquidity Long Term Purchase Commitment By Category Of Item Purchased [Axis] Category of Item Purchased [Axis] Long Term Purchase Commitment Category Of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Name Of Reporting Category [Domain] Name of Reporting Category [Domain] Nature of operations and basis of presentation. Nature Of Operations And Basis Of Presentation Policy [Text Block] Nature of Operations and Basis of Presentation Net Cash Provided By Used In Financing Activities [Abstract] Cash Flows From Financing Activities Net Cash Provided By Used In Financing Activities Continuing Operations Net cash provided by (used in) financing activities Net Cash Provided By Used In Investing Activities [Abstract] Cash Flows From Investing Activities Net Cash Provided By Used In Investing Activities Continuing Operations Net cash used in investing activities Net Cash Provided By Used In Operating Activities Cash flow from operations Net Cash Provided By Used In Operating Activities [Abstract] Cash Flows From Operating Activities Net Cash Provided By Used In Operating Activities Continuing Operations Net cash used in operating activities Net Income Loss Available To Common Stockholders Diluted Net Income loss available to common stockholders, diluted NHLBI. Nhlbi [Member] NHLBI [Member] Nonoperating Income Expense Total Other Income (Expense) Nonoperating Income Expense [Abstract] Other Income (Expense) Number of agreement with consultants for services. Number Of Agreement With Consultants For Services Number of agreement with consultants Number of warrant exercised during period recorded as derivative liability. Number Of Warrant Exercised During Period Recorded As Derivative Liability Exercised derivative liabilities Number of warrants exercised during period recorded as derivative liability Office Space Area Under Lease Agreement Office Space Area Under Lease Agreement Total office space under lease agreement Operating Income Loss Loss from Operations Operating Leases Future Minimum Payments Due Total Operating Leases Future Minimum Payments Due In Rolling Year Five Fiscal year ended March 31, 2019 Operating Leases Future Minimum Payments Due In Rolling Year Four Fiscal year ended March 31, 2018 Operating Leases Future Minimum Payments Due In Rolling Year Three Fiscal year ended March 31, 2017 Operating Leases Future Minimum Payments Due In Rolling Year Two Fiscal year ended March 31, 2016 Operating Leases Future Minimum Payments Due Thereafter Thereafter Operating Leases Future Minimum Payments Next Rolling Twelve Months Fiscal year ended March 31, 2015 Operating Leases Monthly Base Rent Expense Operating Leases Monthly Base Rent Expense Base rent under the lease Operating Leases Monthly Rent Expense Operating Leases Monthly Rent Expense Rent expense per month Operating Leases Of Lessee Contingent Rentals Basis Spread On Variable Rate Base rent escalators Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Text Block] Description of Business and Summary of Significant Accounting Policies Other Assets Noncurrent Other assets, net Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Over Allotment Option [Member] Over Allotment Option [Member] Overallotment Option Exercised [Member] Payment for expense on warrant modification. Payment For Expense On Warrant Modification Expense associated with warrant modification Payments To Acquire Property Plant And Equipment Purchases of fixed assets Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Preferred Stock Shares Authorized Preferred stock, shares authorized Preferred Stock Shares Outstanding Preferred stock, shares outstanding Prepaid Expense And Other Assets Current Prepaid expenses and other current assets Principle Transaction Revenue Description Of Reporting Category [Axis] Principal Transaction Revenue, Description of Reporting Category [Axis] Prior Period Reclassification Adjustment Description Reclassifications Private [Member] Private [Member] Private, Not-for-Profit Organization [Member]