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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]      
Interest expense, debt $ 9,942,000 $ 12,994,000 $ 12,464,000
Operating expenses 85,546,000 16,519,000 83,327,000
Goodwill impairment loss 0 0  
Advertising      
Class of Stock [Line Items]      
Operating expenses $ 0 312,000 372,000
4.50% Exchangeable Senior Notes Due 2023      
Class of Stock [Line Items]      
Debt instrument, additional interest expense, percentage 0.50%    
Interest rate 4.50%    
Additional interest expense $ 817,000 $ 773,000 $ 635,000
4.50% Exchangeable Senior Notes Due 2023 | Pro Forma Adjustments      
Class of Stock [Line Items]      
Interest expense, debt $ 1,408,000