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Stock-Based Compensation Expense - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Shares  
Outstanding, Beginning balance (in shares) | shares 3,713,179
Granted (in shares) | shares 0
Exercised (in shares) | shares (549,612)
Forfeited/canceled (in shares) | shares (26,013)
Outstanding, Ending balance (in shares) | shares 3,137,554
Vested and exercisable (in shares) | shares 2,416,849
Weighted Average Exercise Price  
Outstanding, Beginning balance (in dollars per share) | $ / shares $ 10.32
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 11.02
Forfeited/canceled (in dollars per share) | $ / shares 12.88
Outstanding, Ending balance (in dollars per share) | $ / shares 10.17
Vested and exercisable (in dollars per share) | $ / shares $ 8.90
Weighted Average Remaining Contractual Life (in years)  
Outstanding 5 years 8 months 12 days
Vested and exercisable 5 years 1 month 6 days
Aggregate Intrinsic Value  
Exercised | $ $ 21,286
Outstanding | $ 149,561
Vested and exercisable | $ $ 118,275