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Warrants (Changes in Fair Value of Warrant Liability) (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Class of Warrant or Right, Fair Value [Roll Forward]    
Warrant liability, Beginning balance $ 14,518  
Fair Value of Warrants Granted 5,590  
Fair Value Of Warrants Exercised   $ 324
Change in fair value of warrants (10,520)  
Warrant liability, Ending balance 9,264  
January 2016 Warrants [Member]    
Class of Warrant or Right, Fair Value [Roll Forward]    
Warrant liability, Beginning balance 0  
Fair Value of Warrants Granted 5,590  
Fair Value Of Warrants Exercised 0  
Change in fair value of warrants (1,515)  
Warrant liability, Ending balance 4,075  
March 2015 Warrants [Member]    
Class of Warrant or Right, Fair Value [Roll Forward]    
Warrant liability, Beginning balance 10,337  
Fair Value of Warrants Granted 0  
Fair Value Of Warrants Exercised 0  
Change in fair value of warrants (6,668)  
Warrant liability, Ending balance 3,669  
September 2013 Warrant [Member]    
Class of Warrant or Right, Fair Value [Roll Forward]    
Warrant liability, Beginning balance 1,933  
Fair Value of Warrants Granted 0  
Fair Value Of Warrants Exercised   0
Change in fair value of warrants (1,148)  
Warrant liability, Ending balance 785  
December 2012 Warrants [Member]    
Class of Warrant or Right, Fair Value [Roll Forward]    
Warrant liability, Beginning balance 1,565  
Fair Value of Warrants Granted 0  
Fair Value Of Warrants Exercised   0
Change in fair value of warrants (909)  
Warrant liability, Ending balance 656  
April 2011 Warrants [Member]    
Class of Warrant or Right, Fair Value [Roll Forward]    
Warrant liability, Beginning balance 537  
Fair Value of Warrants Granted 0  
Fair Value Of Warrants Exercised   278
Change in fair value of warrants (184)  
Warrant liability, Ending balance 75  
March 2011 Warrants [Member]    
Class of Warrant or Right, Fair Value [Roll Forward]    
Warrant liability, Beginning balance 146  
Fair Value of Warrants Granted 0  
Fair Value Of Warrants Exercised   $ 46
Change in fair value of warrants (96)  
Warrant liability, Ending balance $ 4