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Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Detail) (Restricted stock units [Member], USD $)
12 Months Ended
Dec. 31, 2013
Restricted stock units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of RSUs, Beginning balance 1,534,200
Number of RSUs, Granted 2,421,965
Number of RSUs, Vested (565,883)
Number of RSUs, Cancelled (64,000)
Number of RSUs, Ending balance 3,326,282
Weighted Average Grant Date Fair Value, Beginning balance $ 2.10
Weighted Average Grant Date Fair Value, Granted $ 1.80
Weighted Average Grant Date Fair Value, Vested $ 3.37
Weighted Average Grant Date Fair Value, Cancelled $ 1.61
Weighted Average Grant Date Fair Value, Ending balance $ 1.68