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Stock-Based Awards - Summary of Options and Restricted Stock Activity (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Rollforward  
Options, beginning balance 12,760,191
Options, granted   
Options, exercised/vested (1,998,000)
Options, forfeitures (37,500)
Options, ending balance 10,724,691
Weighted average exercise price of options, beginning balance $ 0.95
Weighted average exercise price of options, granted   
Weighted average exercise price of options, exercised/vested $ 0.68
Weighted average exercise price of options, forfeitures $ 4.23
Weighted average exercise price of options, ending balance $ 0.99
Restricted stock awards, beginning balance 1,281,144
Restricted stock awards, granted 981,810
Restricted stock awards, exercised/vested (308,334)
Restricted stock awards, forfeitures (5,328)
Restricted stock awards, ending balance 1,949,292