Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of Changes in Fair Value of Financial Instruments (Detail)

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Summary of Significant Accounting Policies - Schedule of Changes in Fair Value of Financial Instruments (Detail) - Level 3 [Member] - Warrants [Member]
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance as of December 31, 2014 $ 13,596
Issuance of financial instrument 258
Change in fair value (10,985)
Settlement of financial instrument (1,513)
Balance as of September 30, 2015 $ 1,356