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Stock-Based Compensation Expense - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Shares  
Outstanding, Beginning balance (in shares) | shares 2,735,392
Granted (in shares) | shares 0
Exercised (in shares) | shares (652,160)
Forfeited/canceled (in shares) | shares (16,484)
Outstanding, Ending balance (in shares) | shares 2,066,748
Vested and exercisable (in shares) | shares 1,906,500
Weighted Average Exercise Price  
Outstanding, Beginning balance (in dollars per share) | $ / shares $ 10.10
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 9.55
Forfeited/canceled (in dollars per share) | $ / shares 17.01
Outstanding, Ending balance (in dollars per share) | $ / shares 10.21
Vested and exercisable (in dollars per share) | $ / shares $ 9.75
Weighted Average Remaining Contractual Life (in years)  
Outstanding 4 years 4 months 24 days
Vested and exercisable 4 years 2 months 12 days
Aggregate Intrinsic Value  
Exercised | $ $ 31,337
Outstanding | $ 105,458
Vested and exercisable | $ $ 98,167