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Convertible Notes - Schedule of Roll-forward of Fair Value of Level 3 (Significant Unobservable Inputs) Convertible Notes (Detail) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 6 Months Ended
Mar. 28, 2013
Jun. 30, 2013
Jun. 30, 2014
Convertible Notes [Member]
Jun. 30, 2013
Convertible Notes [Member]
Jun. 30, 2014
Convertible Notes [Member]
Investor Notes [Member]
Jun. 30, 2013
Convertible Notes [Member]
Investor Notes [Member]
Jun. 30, 2014
Convertible Notes [Member]
Arcapita Notes [Member]
Jun. 30, 2013
Convertible Notes [Member]
Arcapita Notes [Member]
Debt Instrument [Line Items]                
Beginning balance     $ 91,874 $ 95,088 $ 87,479 $ 90,920 $ 4,395 $ 4,168
Issuances of Convertible Notes       3,530   2,090   1,440
Fair value of notes exchanged       (7,253)   (5,971)   (1,282)
Gain on extinguishment of convertible notes 8,900 8,898   (8,898)   (8,498)   (400)
Change in fair value included in interest expense     37,128 (3,247) 35,036 (3,108) 2,092 (139)
Conversion of Convertible Notes     (129,002)   (122,515)   (6,487)  
Ending balance     $ 0 $ 79,220 $ 0 $ 75,433 $ 0 $ 3,787