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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

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- Definition Change In Fair Value Of Warrant Liabilities + References No definition available. + Details
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- Details
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- Definition Fair Value Of Warrants Exercised + References No definition available. + Details
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- Definition Fair value of warrant liabilities as of the balance sheet date. + References No definition available. + Details
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