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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 |  |

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