v2.4.0.8
Fair Value of Financial Instruments - Summary of Change in Fair Value of Level 3 Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance    $ 1,766 $ 1,107 $ 1,767
Issuances         
Change in fair value of derivative liability    (659) (635) (660)
Write-off to Other income (expense)      (472)  
Ending Balance    $ 1,107    $ 1,107