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Warrants (Changes in Fair Value of Warrant Liability) (Detail)
$ in Thousands
 9 Months Ended
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