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Fair Value - Schedule of Changes in Fair Value of Level 3 Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Beginning Balance $ 11,587 $ 309
Derivative liability of embedded conversion feature of the Amended and Restated Bridge Notes   1,187
Derivative liability of embedded conversion feature of the Amended and Restated Reimbursement Notes   156
Derivative liability of embedded conversion feature of the Amended and Restated Convertible Notes   862
Change in fair value 326 9,073
Ending Balance $ 11,913 $ 11,587