Entity Central Index Key Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Value of outstanding redeemable nonconvertible preferred stock. Statement Of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Short-term marketable securities Available For Sale Securities Current Accounts receivable Accounts Receivable Net Current Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Long-term marketable securities Available For Sale Securities Noncurrent Deferred tax assets Deferred Tax Assets Liabilities Net Noncurrent Restricted cash Restricted Cash And Cash Equivalents Noncurrent Total assets Assets Liabilities and Stockholders' Equity Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued expenses and other current liabilities Accrued Liabilities Current Income taxes payable Accrued Income Taxes Current Total current liabilities Liabilities Current Warrant liability Warrants And Rights Outstanding Series 1 nonconvertible preferred stock Non Convertible Preferred Stock Liabilities Other long-term liabilities Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 11) Commitments And Contingencies Stockholders' equity: Stockholders Equity [Abstract] Common stock; $0.01 par value per share, 100,000 shares authorized; 19,150 and 19,120 shares issued and outstanding at December 31, 2017 and September 30, 2017, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Retained earnings Retained Earnings Accumulated Deficit Total stockholders' equity Stockholders Equity Total liabilities and stockholders' equity Liabilities And Stockholders Equity Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] Revenue Revenues [Abstract] Royalties Royalty Revenue Milestones Revenue Recognition Milestone Method Revenue Recognized Total revenue Revenues Operating expenses: Operating Costs And Expenses [Abstract] Research and development Research And Development Expense General and administrative General And Administrative Expense Total operating expenses Costs And Expenses Income (loss) from operations Operating Income Loss Other income (expense): Nonoperating Income Expense [Abstract] Interest income Investment Income Interest Interest expense Interest Expense Change in fair value of warrant liability and Series 1 nonconvertible preferred stock Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net Total other income (expense), net Nonoperating Income Expense Income (loss) before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Income tax (expense) benefit Income Tax Expense Benefit Net income (loss) Net Income Loss Net income (loss) per share: Earnings Per Share [Abstract] Basic Earnings Per Share Basic Diluted Earnings Per Share Diluted Weighted average shares outstanding: Weighted Average Number Of Shares Outstanding Diluted Disclosure Items [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Statement Of Income And Comprehensive Income [Abstract] Net income (loss) Other comprehensive loss: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Net unrealized losses on marketable securities, net of tax of ($107) and ($63) Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Total other comprehensive loss Other Comprehensive Income Loss Net Of Tax Comprehensive income (loss) Comprehensive Income Net Of Tax Net unrealized losses on marketable securities, tax Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax The cash outflow associated with the premium paid on marketable securities. Statement Of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Stock-based compensation expense Share Based Compensation Depreciation and amortization expense Depreciation And Amortization Deferred income taxes Deferred Income Taxes And Tax Credits Income tax benefit from exercise of stock options Excess Tax Benefit From Share Based Compensation Operating Activities Premium on marketable securities Premium On Marketable Securities Amortization of premium on marketable securities Accretion Amortization Of Discounts And Premiums Investments Change in fair value of warrant liability and Series 1 nonconvertible preferred stock Change in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable Increase Decrease In Accounts Payable Accrued expenses Increase Decrease In Accrued Liabilities Income taxes payable Increase Decrease In Accrued Income Taxes Payable Other long-term liabilities Increase Decrease In Other Noncurrent Liabilities Net cash provided by operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Cash flows from investing activities Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Purchase of property and equipment Payments To Acquire Property Plant And Equipment Purchase of marketable securities Payments To Acquire Marketable Securities Proceeds from maturities and sales of marketable securities Proceeds From Sale And Maturity Of Available For Sale Securities Net cash provided by (used in) investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Cash flows from financing activities Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Proceeds from exercise of stock options Proceeds From Stock Options Exercised Payments of capital lease obligations Repayments Of Long Term Capital Lease Obligations Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Continuing Operations Net increase in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for income taxes Income Taxes Paid Accounting Policies [Abstract] Nature of the Business and Basis of Presentation Business Description And Basis Of Presentation [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Fair Value Disclosures [Abstract] Fair Value of Financial Assets and Liabilities Fair Value Disclosures [Text Block] Investments Debt And Equity Securities [Abstract] Marketable Securities Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosure [Text Block] Payables And Accruals [Abstract] Accrued Expenses and Other Long-Term Liabilities Accounts Payable And Accrued Liabilities Disclosure [Text Block] Organization Consolidation And Presentation Of Financial Statements [Abstract] Ongoing Collaboration Agreements Collaborative Arrangement Disclosure [Text Block] The entire disclosure for nonconvertible preferred stock and warrants. Debt Disclosure [Abstract] Warrants to Purchase Series 1 Nonconvertible Preferred Stock and Series 1 Nonconvertible Preferred Stock Nonconvertible Preferred Stock And Warrants [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock-Based Awards Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Net Income (Loss) Per Share Earnings Per Share [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Use of Estimates Use Of Estimates Recently Issued Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Financial Assets and Liabilities that were Subject to Fair Value Measurement on Recurring Basis Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Fair Value Measurements of the Company's Outstanding Warrant Liability and Series 1 Nonconvertible Preferred Stock Fair Value Inputs Liabilities Quantitative Information Table [Text Block] Rollforward of Aggregate Fair Values of Warrants and Outstanding Series 1 Nonconvertible Preferred Stock Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Fair Value of Available-for-Sale Marketable Securities by Type of Security Available For Sale Securities [Text Block] Accrued Expenses and Other Current Liabilities as well as Other Long-Term Liabilities Schedule Of Accrued Liabilities Table [Text Block] Schedule of warrants to purchase non convertible preferred stock. Summary of Activity of the Warrants to Purchase Series 1 Nonconvertible Preferred Stock Schedule Of Warrants To Purchase Non Convertible Preferred Stock Table [Text Block] Statement [Table] Statement [Table] Award Type Award Type [Axis] Equity Award Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Performance share units and relative stockholder return units. Performance Share Units and Relative Total Stockholder Return Units [Member] Performance Share Units And Relative Stockholder Return Units [Member] Statement [Line Items] Statement [Line Items] Summary of Stock Option Activity Including Performance Based Options Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of PSU and rTSRU Activity Schedule Of Nonvested Performance Based Units Activity Table [Text Block] Summary of Restricted Stock Unit Activity Schedule Of Nonvested Restricted Stock Units Activity Table [Text Block] Stock-Based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Number of revenue-generating contract. Summary of Accounting and Financial Policies [Line Items] Summary of Accounting and Financial Policies [Table] Summary Of Accounting And Financial Policies [Table] Summary Of Accounting And Financial Policies [Table] Adjustments for New Accounting Pronouncements Adjustments For New Accounting Pronouncements [Axis] Type of Adoption Type Of Adoption [Member] ASU 2016-18 [Member] Accounting Standards Update201618 [Member] Summary Of Accounting And Financial Policies [Line Items] Summary Of Accounting And Financial Policies [Line Items] Number of revenue-generating contract Number Of Revenue Generating Contract Outstanding letter of credit Letters Of Credit Outstanding Amount Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] U.S. Treasury Notes [Member] U S Treasury Securities [Member] Money Market Funds [Member] Money Market Funds [Member] Corporate Bonds [Member] Corporate Debt Securities [Member] Commercial Paper [Member] Commercial Paper [Member] Level 2 [Member] Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value Inputs Level1 [Member] Level 2 [Member] Fair Value Inputs Level2 [Member] Level 3 [Member] Fair Value Inputs Level3 [Member] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Preferred stock that may not be exchanged into common shares or other types of securities at the owner's option. Series 1 Nonconvertible Preferred Stock [Member] Series One Non Convertible Preferred Stock [Member] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Warrant Liability [Member] Warrant [Member] U.S. Agency Bonds [Member] U S Government Agencies Debt Securities [Member] Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Assets: Assets Fair Value Disclosure [Abstract] Cash equivalents Cash And Cash Equivalents Fair Value Disclosure Available for sale securities, fair value Available For Sale Securities Assets, Fair Value Disclosure, Total Assets Fair Value Disclosure Liabilities: Liabilities Fair Value Disclosure [Abstract] Liabilities Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Liabilities, Fair Value Disclosure, Total Liabilities Fair Value Disclosure Amount of transfers of financial instruments classified as an asset or liability between level 1, level 2, and level 3 of the fair value hierarchy. Transfers between Level 1, Level 2 and Level 3 Fair Value Measurements Inter Transfers Between Levels Warrant expiration date Investment Warrants Expiration Date Warrants outstanding Class Of Warrant Or Right Outstanding Percentage of likelihood that an outcome would occur that would require a transfer of value upon exercise of warrants, used as an input to measure fair value. Fair Value Inputs Liabilities Quantitative Information [Table] Fair Value Inputs Liabilities Quantitative Information [Table] Range Range [Axis] Range Range [Member] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Fair Value Inputs, Liabilities, Quantitative Information [Line Items] Fair Value Inputs Liabilities Quantitative Information [Line Items] Probabilities of payout Fair Value Inputs Probability Of Payout Discount rate Fair Value Inputs Discount Rate Fair value of warrants exercised and issued into series one nonconvertible preferred stock. Fair value of warrants expired. 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 [Line Items] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Beginning Balance Warrants exercised Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Increase Decrease From Warrants Exercised Warrants expired Fair Value Of Warrants Expired Ending Balance Schedule Of Available For Sale Securities [Table] Schedule Of Available For Sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Schedule Of Available For Sale Securities [Line Items]