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Warrants (Changes in Fair Value of Warrant Liability) (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2015 USD ($)
Class of Warrant or Right [Line Items] |
Fair Value of Warrants Granted | $ 10,296
Class of Warrant or Right, Fair Value [Roll Forward] |
Warrant liability, Beginning balance | 5,383
Change in fair value of warrants | 982
Warrant liability, Ending balance | 16,661
March 2015 Warrants [Member] |
Class of Warrant or Right [Line Items] |
Fair Value of Warrants Granted | 10,296
Class of Warrant or Right, Fair Value [Roll Forward] |
Warrant liability, Beginning balance | 0
Change in fair value of warrants | 1,313
Warrant liability, Ending balance | 11,609
September 2013 Warrant [Member] |
Class of Warrant or Right [Line Items] |
Fair Value of Warrants Granted | 0
Class of Warrant or Right, Fair Value [Roll Forward] |
Warrant liability, Beginning balance | 2,560
Change in fair value of warrants | (157)
Warrant liability, Ending balance | 2,403
December 2012 Warrants [Member] |
Class of Warrant or Right, Fair Value [Roll Forward] |
Warrant liability, Beginning balance | 2,027
Change in fair value of warrants | (162)
Warrant liability, Ending balance | 1,865
April 2011 Warrants [Member] |
Class of Warrant or Right, Fair Value [Roll Forward] |
Warrant liability, Beginning balance | 625
Change in fair value of warrants | (10)
Warrant liability, Ending balance | 615
March 2011 Warrants [Member] |
Class of Warrant or Right, Fair Value [Roll Forward] |
Warrant liability, Beginning balance | 163
Change in fair value of warrants | 2
Warrant liability, Ending balance | 165
March 2010 Warrants [Member] |
Class of Warrant or Right, Fair Value [Roll Forward] |
Warrant liability, Beginning balance | 8
Change in fair value of warrants | (4)
Warrant liability, Ending balance | $ 4

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