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Share-Based Compensation - Equity Incentive Plans (Details)
9 Months Ended
May 19, 2020
shares
Sep. 30, 2021
plan
shares
Dec. 31, 2020
shares
Sep. 30, 2020
shares
Dec. 31, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of equity incentive plans | plan   2      
Stok option award outstanding (in shares)   5,000 5,000 5,000 5,000
2009 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of awards that may be granted (in shares)   0      
Stok option award outstanding (in shares)   1      
2016 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Increase in total number of shares authorized for issuance (in shares) 2,000,000        
Total number of shares authorized for issuance (in shares) 3,700,000