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Stock-Based Compensation - Summary of Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Restricted Stock Units  
Nonvested RSUs at December 31, 2016 (shares) | shares 4,307,592
Granted (shares) | shares 1,131,231
Vested (shares) | shares (1,102,727)
Forfeited (shares) | shares (994,248)
Nonvested RSUs at December 31, 2017 (shares) | shares 3,341,848
Weighted Average Grant Date Fair Value Per Share  
Weighted Average Grant Date Fair Value, Beginning Balance (in usd per share) | $ / shares $ 9.80
Weighted Average Grant Date Fair Value, Granted (in usd per share) | $ / shares 15.77
Weighted Average Grant Date Fair Value, Vested (in usd per share) | $ / shares 12.47
Weighted Average Grant Date Fair Value, Forfeited (in usd per share) | $ / shares 9.40
Weighted Average Grant Date Fair Value, Ending Balance (in usd per share) | $ / shares $ 11.05
Aggregate Intrinsic Value  
Aggregate Intrinsic Value, Beginning Balance | $ $ 77,192
Aggregate Intrinsic Value, Granted | $
Aggregate Intrinsic Value, Ending Balance | $ $ 36,526