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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ 472 $ 1,421 $ 1,107 $ 1,767
Issuances            
Change in fair value of derivative liability    345 (635) (1)
Write-off to Other income (expense) (472)   (472)  
Ending Balance    $ 1,766    $ 1,766