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Stock-Based Compensation Expense - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Shares  
Outstanding, Beginning balance (in shares) | shares 2,705,458
Granted (in shares) | shares 0
Exercised (in shares) | shares (125,432)
Forfeited/canceled (in shares) | shares (11,250)
Outstanding, Ending balance (in shares) | shares 2,568,776
Vested and exercisable (in shares) | shares 2,255,925
Weighted Average Exercise Price  
Outstanding, Beginning balance (in dollars per share) | $ / shares $ 10.18
Granted (in dollars per share) | $ / shares 0
Exercised (in dollars per share) | $ / shares 12.50
Forfeited/canceled (in dollars per share) | $ / shares 12.47
Outstanding, Ending balance (in dollars per share) | $ / shares 10.06
Vested and exercisable (in dollars per share) | $ / shares $ 9.34
Weighted Average Remaining Contractual Life (in years)  
Outstanding 4 years 9 months 18 days
Vested and exercisable 4 years 7 months 6 days
Aggregate Intrinsic Value  
Exercised | $ $ 4,519
Outstanding | $ 85,461
Vested and exercisable | $ $ 76,671