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Stock-Based Compensation - Options (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Aggregate Intrinsic Value [Abstract]          
Closing price (in dollars per share) $ 10.98   $ 10.98    
Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation costs related to unvested stock options not yet recognized $ 600,000   $ 600,000    
Value of estimated forfeitures     $ 56,000    
Weighted-average period of amortization     2 years    
Number of Options Outstanding [Roll Forward]          
Options outstanding, beginning of period (in shares)     1,885    
Granted (in shares) 0 0 0 0  
Exercised (in shares)     (348)    
Options outstanding, end of period (in shares) 1,537   1,537   1,885
Options vested and unvested options expected to vest, net of forfeitures, end of period (in shares) 1,530   1,530    
Options exercisable, end of period (in shares) 1,168   1,168    
Weighted-average Exercise Price [Roll Forward]          
Options outstanding, beginning of period (in dollars per share)     $ 4.42    
Exercised (in dollars per share)     3.23    
Options outstanding, end of period (in dollars per share) $ 4.69   4.69   $ 4.42
Options vested and unvested options expected to vest, net of forfeitures (in dollars per share) 4.69   4.69    
Options exercisable, end of period (in dollars per share) $ 4.94   $ 4.94    
Weighted average Remaining Contractual Life [Abstract]          
Options outstanding     6 years 1 month 28 days   6 years 2 months 1 day
Options vested and unvested options expected to vest, net of forfeitures, end of period     6 years 1 month 24 days    
Option exercisable, end of period     5 years 6 months 21 days    
Aggregate Intrinsic Value [Abstract]          
Options outstanding, beginning of period     $ 9,713,000    
Options outstanding, end of period $ 9,678,000   9,678,000   $ 9,713,000
Options vested and expected to vest, end of period 9,619,000   9,619,000    
Options exercisable, end of period $ 7,051,000   $ 7,051,000