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Stockholders' Equity - Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock [Member], USD $)
9 Months Ended
Sep. 30, 2013
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Units outstanding, beginning of year 582,212
Number of Units, Granted 736,479
Number of Units, Released (158,700)
Number of Units, Forfeited (44,814)
Number of Units outstanding, end of year 1,115,177
Weighted Average Grant Date Fair Value, Units outstanding, beginning of period $ 5.42
Weighted Average Grant Date Fair Value, Granted $ 8.98
Weighted Average Grant Date Fair Value, Released $ 5.39
Weighted Average Grant Date Fair Value, Forfeited $ 7.24
Weighted Average Grant Date Fair Value, Units outstanding, end of period $ 7.71
Aggregate intrinsic value, Units outstanding, beginning of period   
Aggregate intrinsic value, Granted   
Aggregate intrinsic value, Released   
Aggregate intrinsic value, Forfeited   
Aggregate intrinsic value, Units outstanding, end of period $ 16,593,834