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Warrants (Changes in Fair Value of Warrant Liability) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance $ 10,964 $ 3,746 $ 48,965
Fair Value of Warrants Granted 8,238 7,286  
Fair value of warrants exercised (14,249) 10,843  
Change in fair value of warrants 44,012 10,775  
Warrant liability, Ending balance   10,964 48,965
September 2013 Warrant [Member]
      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 0 0 22,950
Fair Value of Warrants Granted 8,238 0  
Fair value of warrants exercised (1,931) 0  
Change in fair value of warrants 16,643 0  
Warrant liability, Ending balance   0 22,950
December 2012 Warrants [Member]
      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 6,954 0 18,060
Fair Value of Warrants Granted   7,286  
Fair value of warrants exercised (8,482) 0  
Change in fair value of warrants 19,588 (332)  
Warrant liability, Ending balance   6,954 18,060
April 2011 Warrants [Member]
      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 3,310 3,145 5,069
Fair Value of Warrants Granted   0  
Fair value of warrants exercised (3,455) 8,130  
Change in fair value of warrants 5,214 8,295  
Warrant liability, Ending balance   3,310 5,069
March 2011 Warrants [Member]
      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 378 421 763
Fair Value of Warrants Granted   0  
Fair value of warrants exercised (260) 2,456  
Change in fair value of warrants 645 2,413  
Warrant liability, Ending balance   378 763
March 2010 Warrants [Member]
      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 187 116 945
Fair Value of Warrants Granted   0  
Fair value of warrants exercised (121) 257  
Change in fair value of warrants 879 328  
Warrant liability, Ending balance   187 945
August 2009 Warrants [Member]
      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 135 64 1,178
Fair Value of Warrants Granted   0  
Fair value of warrants exercised 0 0  
Change in fair value of warrants 1,043 71  
Warrant liability, Ending balance   $ 135 $ 1,178