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Cash, Cash Equivalents and Investments - Investment Category and Length (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) company | Dec. 31, 2021 USD ($) company | Dec. 31, 2020 USD ($) | May 31, 2022 USD ($) | Apr. 30, 2022 USD ($)
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months | $ 2,118,000 | $ 12,151,000 |  |  |
Gross unrealized (loss), in loss position less than twelve months | (42,000) | (61,000) |  |  |
Fair value, in loss position greater than twelve months | 8,988,000 | 2,013,000 |  |  |
Gross unrealized (loss), in loss position greater than twelve months | (261,000) | (4,000) |  |  |
Fair value, total in loss position | 11,106,000 | 14,164,000 |  |  |
Gross unrealized (loss), total in loss position | (303,000) | (65,000) |  |  |
Restricted Cash |  |  |  |  |
Restricted cash | 6,400,000 |  |  |  |
Minority Investments |  |  |  |  |
Investments, equity method | $ 14,607,000 | $ 10,166,000 |  |  |
Number of equity method investments | company | 6 | 5 |  |  |
Impairment charge | $ 0 | $ 0 | $ 0 |  |
Bank Of Beijing |  |  |  |  |
Restricted Cash |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 3,400,000 |
Bank Of Beijing | Secured debt |  |  |  |  |
Restricted Cash |  |  |  |  |
Time deposit | 2,500,000 |  |  | $ 1,000,000.0 | $ 2,900,000
Certificates of deposit. |  |  |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months | 2,118,000 | 6,181,000 |  |  |
Gross unrealized (loss), in loss position less than twelve months | (42,000) | (19,000) |  |  |
Fair value, in loss position greater than twelve months | 4,146,000 |  |  |  |
Gross unrealized (loss), in loss position greater than twelve months | (133,000) |  |  |  |
Fair value, total in loss position | 6,264,000 | 6,181,000 |  |  |
Gross unrealized (loss), total in loss position | (175,000) | (19,000) |  |  |
Corporate bonds |  |  |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months |  | 5,970,000 |  |  |
Gross unrealized (loss), in loss position less than twelve months |  | (42,000) |  |  |
Fair value, in loss position greater than twelve months | 4,842,000 | 2,013,000 |  |  |
Gross unrealized (loss), in loss position greater than twelve months | (128,000) | (4,000) |  |  |
Fair value, total in loss position | 4,842,000 | 7,983,000 |  |  |
Gross unrealized (loss), total in loss position | (128,000) | (46,000) |  |  |
Other assets |  |  |  |  |
Minority Investments |  |  |  |  |
Investments, equity method | $ 14,600,000 | $ 10,200,000 |  |  |

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