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Supplemental Financial Statement Information - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Concentration Risk [Line Items] |  |
Restricted cash | $ 3,090,000 | $ 3,090,000
Allowance for credit loss | 0 | 0
Depreciation | 1,983,000 | 2,540,000
Impairment of property and equipment | 500,000 |
Finite-lived intangible assets | 17,200,000 | 17,200,000
Accumulated amortization and impairment charges | 17,200,000 | 17,200,000
Indefinite-lived intangible assets (excluding goodwill) | 5,100,000 | 5,100,000
Impairment charges | 3,200,000 | 3,200,000
Amortization of acquired intangible assets | $ 0 | $ 0
Impairment Of Intangible Asset, Indefinite Lived, Excluding Goodwill, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag | impairment charges |
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] | Restructuring Costs and Asset Impairment Charges |
China |  |
Concentration Risk [Line Items] |  |
Deposits | $ 5,000,000 |

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