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Stock-Based Compensation - Movement of PSUs and RSUs (Details) - $ / shares
1 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
PSUs    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)   1,003,745
Granted (in shares)   288,244
Performance based adjustment (in shares)   (40,087)
Settled (in shares)   (378,165)
Forfeited (in shares)   (8,709)
Outstanding, end of period (in shares)   865,028
Expected to vest (in shares)   550,318
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)   197,582
Granted (in shares)   161,269
Performance based adjustment (in shares)   0
Settled (in shares)   0
Forfeited (in shares)   (4,348)
Outstanding, end of period (in shares)   354,503
Expected to vest (in shares)   346,730
2017 Plan | PSUs    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)   418,252
Granted (in shares)   0
Performance based adjustment (in shares) 40,087 (40,087)
Settled (in shares)   (378,165)
Forfeited (in shares)   0
Outstanding, end of period (in shares)   0
Expected to vest (in shares)   0
Weighted av (in USD per share)   $ 24.89
2018 Plan | PSUs    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)   355,766
Granted (in shares)   0
Performance based adjustment (in shares)   0
Settled (in shares)   0
Forfeited (in shares)   (4,360)
Outstanding, end of period (in shares)   351,406
Expected to vest (in shares)   173,076
Weighted av (in USD per share)   $ 39.24
2018 Plan | RSUs | Employees, Sign On    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)   23,878
Granted (in shares)   0
Performance based adjustment (in shares)   0
Settled (in shares)   0
Forfeited (in shares)   0
Outstanding, end of period (in shares)   23,878
Expected to vest (in shares)   23,878
Weighted av (in USD per share)   $ 25.81
2019 Plan | PSUs    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)   229,727
Granted (in shares)   0
Performance based adjustment (in shares)   0
Settled (in shares)   0
Forfeited (in shares)   (4,349)
Outstanding, end of period (in shares)   225,378
Expected to vest (in shares)   108,459
Weighted av (in USD per share)   $ 11.48
2019 Plan | RSUs | Employees, Sign On    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)   45,257
Granted (in shares)   0
Performance based adjustment (in shares)   0
Settled (in shares)   0
Forfeited (in shares)   0
Outstanding, end of period (in shares)   45,257
Expected to vest (in shares)   45,257
Weighted av (in USD per share)   $ 15.89
2019 Plan | RSUs | Employees, Existing    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)   128,447
Granted (in shares)   0
Performance based adjustment (in shares)   0
Settled (in shares)   0
Forfeited (in shares)   (4,348)
Outstanding, end of period (in shares)   124,099
Expected to vest (in shares)   121,770
Weighted av (in USD per share)   $ 14.74
2020 Plan | PSUs    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)   0
Granted (in shares)   288,244
Performance based adjustment (in shares)   0
Settled (in shares)   0
Forfeited (in shares)   0
Outstanding, end of period (in shares)   288,244
Expected to vest (in shares)   268,783
Weighted av (in USD per share)   $ 11.60
2020 Plan | RSUs | Employees, Existing    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)   0
Granted (in shares)   161,269
Performance based adjustment (in shares)   0
Settled (in shares)   0
Forfeited (in shares)   0
Outstanding, end of period (in shares)   161,269
Expected to vest (in shares)   155,825
Weighted av (in USD per share)   $ 12.51