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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Contingency [Line Items]        
Provision (benefit) for income taxes $ 483 $ (2,368) $ (22,795)  
Effective rate (1.60%) 0.70% 6.90%  
Deferred tax liabilities, indefinite-lived intangible assets     $ 1,900  
Federal and state research tax credits $ 1,828 $ 1,828    
Unrecognized tax benefits that would not impact effective tax rate 600      
Unrecognized tax benefits $ 609 $ 678 $ 753 $ 934
Tax receivable agreement, percent of cash savings paid to shareholders 85.00%      
Tax receivable agreement, percent of cash savings not paid to shareholders 15.00%      
Periods Prior to June 2015        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 79,300      
Federal        
Income Tax Contingency [Line Items]        
Federal and state research tax credits 2,100      
State and Local Jurisdiction        
Income Tax Contingency [Line Items]        
Federal and state research tax credits 300      
Finite-lived Tax Credit Carryforward | Federal        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards 203,700      
Finite-lived Tax Credit Carryforward | State and Local Jurisdiction        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards 290,800      
Indefinite-lived Tax Credit Carryforward | Federal        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards 292,900      
Indefinite-lived Tax Credit Carryforward | State and Local Jurisdiction        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 196,000