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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Repurchase of common stock for employee tax withholding obligations amount $ 1,119 $ 1,062  
Recognition period of unrecognized cost 1 year 6 months    
Total unrecognized compensation cost related to non-vested stock option awards $ 2,700    
Minimum      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share based compensation arrangement performance period 1 year 4 months 24 days    
Maximum      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Share based compensation arrangement performance period 3 years 4 months 24 days    
Requisite service period 3 years    
2017 Plan      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Useful Term of the plan 10 years    
Common stock shares issuable 1,750,000    
Shares available for grant 736,786    
2007 Plan | Performance-based Restricted Stock Units ("PBRS")      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Shares available for grant     0
Awards with grant date fair value during the period $ 3,200    
Liability based PRSU 800   $ 800
Payments to employees 0   2,600
Unamortized cost $ 2,700    
Recognition period of unrecognized cost 2 years 3 months 18 days    
2007 Plan | Restricted Stock Awards And Restricted Stock Units      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Payments to employees $ 100 200  
Paid to employees as shares   $ 800  
Repurchase of common stock for employee tax withholding obligations amount, shares 25,856 17,961  
Repurchase of common stock for employee tax withholding obligations amount $ 1,100 $ 1,100  
Unamortized cost $ 5,000    
Recognition period of unrecognized cost 1 year 2 months 12 days    
Liabilities related to restricted stock $ 200   $ 200
Vested, shares 3,174 2,815  
2007 Plan | Minimum      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Award vesting period 3 years    
2007 Plan | Maximum      
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]      
Award vesting period 4 years