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Warrants (Changes in Fair Value of Warrant Liability) (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance $ 48,965
Fair value of warrants exercised (27,026)
Change in fair value of warrants (13,174)
Warrant liability, Ending balance 8,765
September 2013 Warrant [Member]
  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 22,950
Fair value of warrants exercised (12,713)
Change in fair value of warrants (6,066)
Warrant liability, Ending balance 4,171
December 2012 Warrants [Member]
  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 18,060
Fair value of warrants exercised (10,086)
Change in fair value of warrants (4,605)
Warrant liability, Ending balance 3,369
April 2011 Warrants [Member]
  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 5,069
Fair value of warrants exercised (2,906)
Change in fair value of warrants (1,214)
Warrant liability, Ending balance 949
March 2011 Warrants [Member]
  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 763
Fair value of warrants exercised 0
Change in fair value of warrants (505)
Warrant liability, Ending balance 258
March 2010 Warrants [Member]
  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 945
Fair value of warrants exercised (1,159)
Change in fair value of warrants 232
Warrant liability, Ending balance 18
August 2009 Warrants [Member]
  
Class of Warrant or Right, Fair Value [Roll Forward]  
Warrant liability, Beginning balance 1,178
Fair value of warrants exercised (162)
Change in fair value of warrants (1,016)
Warrant liability, Ending balance $ 0