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Condensed Consolidated Financial Statements Detail - Additional Information 2 (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2012 | Feb. 28, 2010 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Class of Warrant or Right [Line Items] |  |  |  |  |
Reclassification of contingent warrant liability to equity upon exercise of warrants |  |  | $ 3,552 | $ 2,526 |
Warrants issued (in shares) |  |  | 1,410,474 |  |
Two Year Warrants Issued in December 2014 [Member] |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |
Warrants outstanding (in shares) |  |  | 8,097,165 |  | 8,097,165
Exercise price of warrants (in dollars per share) |  |  |  |  | $ 7.90
Fair value of warrant liability |  |  | $ 1,000 |  | $ 5,200
Gain (loss) on revaluation of warrant liability |  |  | $ 4,200 |  |
Warrant term |  |  |  |  | 2 years
Five Year Warrants Issued in March 2012 [Member] |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |
Warrants outstanding (in shares) | 14,834,577 |  | 9,585,153 |  | 12,109,418
Exercise price of warrants (in dollars per share) | $ 1.76 |  |  |  |
Fair value of warrant liability |  |  | $ 3,100 |  | $ 26,700
Gain (loss) on revaluation of warrant liability |  |  | 20,000 |  |
Warrant term | 5 years |  |  |  |
Gain (loss) on revaluation of warrant liability related to exercised warrants |  |  | $ 2,200 |  |
Warrants exercise (in shares) |  |  | 2,524,265 |  |
Reclassification of contingent warrant liability to equity upon exercise of warrants |  |  | $ 3,600 |  |
Cashless exercise of warrants (in shares) |  |  | 2,523,515 |  |
Five Year Warrants Issued in February 2010 [Member] |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |
Warrants outstanding (in shares) |  | 1,260,000 |  |  |
Exercise price of warrants (in dollars per share) |  | $ 10.50 |  |  |
Warrant term |  | 5 years |  |  |

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