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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 22, 2018
Dec. 31, 2017
Dec. 22, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]              
Provision (benefit) for income taxes       $ (21,536) $ 40 $ (6,637)  
Taxes payable       $ 600 $ 500    
Effective rate       6.70% (0.10%) 8.70%  
Deferred tax liabilities, indefinite-lived intangible assets       $ 1,900      
Prior year effective income tax percentage     35.00%        
Unrecognized tax benefits   $ 762   753 $ 934 $ 762 $ 0
Effective income tax rate, Tax Cuts and Jobs Act, percent     0.21        
Tax cuts and jobs act, incomplete accounting, provisional income tax expense   $ 5,800          
Tax cuts and jobs act, measurement period adjustment, income tax expense (benefit) $ (300)            
Unrecognized tax benefits that would not impact effective tax rate       $ 800      
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%      
Federal and state research tax credits       $ 1,828 $ 1,828    
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       203,000      
Finite-lived Tax Credit Carryforward | State and Local Jurisdiction              
Income Tax Contingency [Line Items]              
Net operating loss carryforwards       257,000      
Indefinite-lived Tax Credit Carryforward | Federal              
Income Tax Contingency [Line Items]              
Net operating loss carryforwards       236,000      
Indefinite-lived Tax Credit Carryforward | State and Local Jurisdiction              
Income Tax Contingency [Line Items]              
Net operating loss carryforwards       $ 137,000