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Basis of Presentation, Summary of Significant Accounting Policies and Change in Accounting Principles - Restricted Cash and Restricted Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | $ 29,259 | $ 21,644 | $ 31,447 |
Current restricted cash |  | 16,509 | 14,374 |  |
Total current restricted cash and restricted investments |  | 16,509 | 14,374 |  |
Non-current restricted cash |  | 12,750 | 6,654 |  |
Total non-current restricted cash and restricted investments |  | 12,750 | 6,654 |  |
Cash and cash equivalents |  | 252,496 | 319,002 | 370,514 |
Restricted cash and restricted investments |  | 29,259 | 21,644 | 31,447 |
Restricted investments included in restricted cash and restricted investments |  | 0 |  | (1,410) |
Total cash and cash equivalents and restricted cash shown in the consolidated statements of cash flows (1) | [1] | 281,755 | 361,581 | $ 400,551 | $ 128,531
Discontinued Operations, Disposed of by Sale | True Health |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Non-current restricted investments |  |  | 600 |  |
Current restricted cash from claims processing services |  |  | 100 |  |
Collateral for letters of credit for facility leases |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 3,410 | 3,510 |  |
Restricted cash and restricted investments |  | 3,410 | 3,510 |  |
Collateral with financial institutions |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 11,957 | 4,743 |  |
Restricted cash and restricted investments |  | 11,957 | 4,743 |  |
Claims processing services |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 13,169 | 12,064 |  |
Restricted cash and restricted investments |  | 13,169 | 12,064 |  |
Other |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 723 | 1,327 |  |
Restricted cash and restricted investments |  | 723 | 1,327 |  |
Bank time deposits |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Restricted funds |  | 12,000 | 4,700 |  |
Restricted cash and restricted investments |  | $ 12,000 | $ 4,700 |  |
[1] | As a result of the closing of the sale of True Health SPA, the consolidated statements of operations, consolidated balance sheets, and related financial information reflect the Company’s operations and assets and liabilities of True Health as discontinued operations for all periods presented. Cash flows and comprehensive income have not been adjusted and are included in the consolidated statements of cash flows and consolidated statements of comprehensive income (loss) for all periods presented. See Note 5.

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