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Significant Accounting Policies - Additional Information (Detail) |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) Tranche shares | Feb. 27, 2015 shares | Dec. 31, 2014 USD ($) shares | Sep. 30, 2015 USD ($) Tranche shares | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Tranche Segment shares | Sep. 30, 2014 USD ($) | Mar. 05, 2015 USD ($) | May. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred revenue | $ 923,000 |  |  | $ 923,000 |  | $ 923,000 |  |  |  | $ 1,700,000 |
Sales discount percentage | 2.00% |  |  | 2.00% |  | 2.00% |  |  |  |  |
Sales discount term |  |  |  |  |  | 30 days |  |  |  |  |
Trade receivables, credit period |  |  |  |  |  | 30 days |  |  |  |  |
Number of tranches for private placement transaction | Tranche | 2 |  |  | 2 |  | 2 |  |  |  |  |
Accounts receivable written off | $ 0 |  |  | $ 0 |  | $ 0 |  |  |  |  |
Warrants expiration date |  |  |  |  |  | Feb. 27, 2015 |  |  |  |  |
Warrants exercised | shares |  |  |  |  |  | 1,844,585 |  |  |  |  |
Warrants expired | shares |  | 6,242,803 |  |  |  |  |  |  |  |  |
Warrant derivative liability |  |  | $ 100,000 |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, risk-free rate |  |  | 0.04% |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, term |  |  | 1 month 28 days |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, dividend yield |  |  | 0.00% |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, volatility rate |  |  | 79.00% |  |  |  |  |  |  |  |
Gain (loss) on change in fair value of derivative liability |  |  |  | (230,000) | $ 4,466,000 | $ (366,000) | $ 11,870,000 |  |  |  |
Number of operating segments | Segment |  |  |  |  |  | 1 |  |  |  |  |
Embedded Derivative Financial Instruments |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on change in fair value of derivative liability | (300,000) |  |  |  |  | $ 470,000 | 5,600,000 |  |  |  |
Maximum repayment of future revenue and receivables |  |  |  |  |  |  |  |  |  |  | $ 150,000,000
Long term debt redemption feature | $ 5,100,000 |  | $ 4,800,000 | $ 5,100,000 |  | 5,100,000 |  |  |  |  |
Preferred Stock Purchase Option |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on change in fair value of derivative liability |  |  |  |  |  | $ (946,000) |  |  |  |  |
Derivative liability at fair value |  |  |  |  |  |  |  | $ 900,000 |  |  |
Warrants Issued October 2009 |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding | shares | 0 |  |  | 0 |  | 0 |  |  |  |  |
Gain (loss) on change in fair value of derivative liability |  |  |  |  |  | $ 110,000 | $ 6,270,000 |  |  |  |
Top Three Customers | Gross Product Sales | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 95.00% | 95.00% |  |  |  |
Top Three Customers | Accounts Receivable | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  | 95.00% | 96.00% |  |  |  |
Prior To Agreement |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Warrants expiration date |  |  |  |  |  | Oct. 16, 2014 |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on change in fair value of derivative liability |  |  |  |  |  | $ 800,000 |  |  |  |  |
Derivative liability at fair value |  |  |  |  |  |  |  |  | $ 3,500,000 |  |
Convertible Debt | 2014 Notes |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes, discount |  |  |  |  |  |  |  |  | $ 27,900,000 |  |
Derivative liability fair value assumptions, risk-free rate | 2.70% |  | 2.70% |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, dividend yield | 22.90% |  | 24.80% |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, volatility rate | 83.00% |  | 82.00% |  |  |  |  |  |  |  |
Gain (loss) on change in fair value of derivative liability | $ 800,000 |  |  |  |  |  |  |  |  |  |
Long term debt redemption feature | 1,800,000 |  | $ 2,600,000 | $ 1,800,000 |  | 1,800,000 |  |  |  |  |
Convertible Debt | 2012 Notes |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes, discount | 0 |  | 0 | 0 |  | 0 |  |  |  |  |
Convertible Debt | Non Cash | 2014 Notes |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes, discount | $ 23,900,000 |  | $ 28,200,000 | $ 23,900,000 |  | $ 23,900,000 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Short term highly liquid instruments, maturity date |  |  |  |  |  | 90 days |  |  |  |  |
Warrants outstanding | shares |  |  | 8,087,388 |  |  |  |  |  |  |  |
Maximum | Embedded Derivative Financial Instruments |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, term | 5 years 4 months 24 days |  | 3 years 7 months 6 days |  |  |  |  |  |  |  |
Derivative liability fair value assumption, coupon rate | 12.50% |  | 10.80% |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, market yields | 18.80% |  | 16.80% |  |  |  |  |  |  |  |
Minimum | Embedded Derivative Financial Instruments |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, term | 2 years 3 months 18 days |  | 2 years 3 months 18 days |  |  |  |  |  |  |  |
Derivative liability fair value assumption, coupon rate | 8.90% |  | 9.80% |  |  |  |  |  |  |  |
Derivative liability fair value assumptions, market yields | 10.50% |  | 10.00% |  |  |  |  |  |  |  |

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