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Stock-Based Compensation Expense - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Shares  
Outstanding, Beginning balance (in shares) | shares 1,933,013
Granted (in shares) | shares 0
Exercised (in shares) | shares (170,006)
Forfeited/canceled (in shares) | shares 0
Outstanding, Ending balance (in shares) | shares 1,763,007
Vested and exercisable (in shares) | shares 1,736,419
Weighted Average Exercise Price  
Outstanding, Beginning balance (in dollars per share) | $ / shares $ 10.07
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 8.34
Forfeited/canceled (in dollars per share) | $ / shares 0
Outstanding, Ending balance (in dollars per share) | $ / shares 10.24
Vested and exercisable (in dollars per share) | $ / shares $ 10.04
Weighted Average Remaining Contractual Life (in years)  
Outstanding 3 years 10 months 24 days
Vested and exercisable 3 years 9 months 18 days
Aggregate Intrinsic Value  
Exercised | $ $ 12,550
Outstanding | $ 113,492
Vested and exercisable | $ $ 112,127