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Investments and Fair Value Measurements - Investment Category and Length (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) company | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) company
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |  |
Fair value, in loss position less than twelve months | $ 10,881 |  | $ 10,881 |  | $ 12,151
Gross unrealized (loss), in loss position less than twelve months | (306) |  | (306) |  | (61)
Fair value, in loss position greater than twelve months | 1,000 |  | 1,000 |  | 2,013
Gross unrealized (loss), in loss position greater than twelve months | (3) |  | (3) |  | (4)
Fair value, total in loss position | 11,881 |  | 11,881 |  | 14,164
Gross unrealized (loss), total in loss position | (309) |  | (309) |  | (65)
Restricted Cash |  |  |  |  |
Restricted cash | 3,900 |  | 3,900 |  |
Minority Investments |  |  |  |  |
Investments, equity method | 13,082 |  | $ 13,082 |  | $ 10,166
Number of equity method investments | company |  |  | 5 |  | 5
Impairment charge | 0 | $ 0 | $ 0 | $ 0 |
Bank Of Beijing |  |  |  |  |
Restricted Cash |  |  |  |  |
Maximum borrowing capacity | 3,400 |  | 3,400 |  |
Bank Of Beijing | Secured debt |  |  |  |  |
Restricted Cash |  |  |  |  |
Time deposit | 3,900 |  | 3,900 |  |
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 | 6,059 |  | 6,059 |  | $ 6,181
Gross unrealized (loss), in loss position less than twelve months | (141) |  | (141) |  | (19)
Fair value, total in loss position | 6,059 |  | 6,059 |  | 6,181
Gross unrealized (loss), total in loss position | (141) |  | (141) |  | (19)
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 | 4,822 |  | 4,822 |  | 5,970
Gross unrealized (loss), in loss position less than twelve months | (165) |  | (165) |  | (42)
Fair value, in loss position greater than twelve months | 1,000 |  | 1,000 |  | 2,013
Gross unrealized (loss), in loss position greater than twelve months | (3) |  | (3) |  | (4)
Fair value, total in loss position | 5,822 |  | 5,822 |  | 7,983
Gross unrealized (loss), total in loss position | (168) |  | (168) |  | (46)
Other assets |  |  |  |  |
Minority Investments |  |  |  |  |
Investments, equity method | $ 13,100 |  | $ 13,100 |  | $ 10,200

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