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], USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Warrants [Member]
 
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance as of December 31, 2013 $ 6,466
Issuance of financial instrument 443
Change in fair value 2,289
Settlement of financial instrument (432)
Balance as of September 30, 2014 8,766
Forward Contract [Member]
 
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance as of December 31, 2013 453
Change in fair value (10)
Settlement of financial instrument $ (443)