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Profit Interest Units of SIS Holdings LP - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation costs $ 3,460,000 $ 4,235,000  
Equity-based compensation costs, tax benefit $ 0 $ 0  
Class B Profit Interest Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares originally available for issuance (in shares)     1,000,000
Exit event, change in ownership, percentage, minimum 50.00%    
Equity-based compensation costs not yet recognized, number of shares (in shares) 568    
Equity-based compensation costs not yet recognized $ 400,000    
Equity-based compensation costs not yet recognized, period for recognition 1 year 10 days    
Class B Profit Interest Units | Vesting Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 25.00%    
Class B Profit Interest Units | Vesting Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 42 months