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Revenue Recognition - Contract Balances (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |  |  |
Short-term receivables | $ 172,171 | $ 172,171 | $ 122,167
Long-term receivables | 4,796 | 4,796 | 4,554
Short-term contract assets | 0 | 0 | 329
Short-term deferred revenue | 13,785 | 13,785 | 10,187
Long-term deferred revenue | 4,457 | 4,457 | 3,593
Deferred revenue |  |  |
Balance as of beginning-of-period |  | 13,780 |
Reclassification to revenue, as a result of performance obligations satisfied |  | (9,343) |
Cash received in advance of satisfaction of performance obligations |  | 13,805 |
Balance as of end of period | 18,242 | 18,242 |
Revenue recognized from performed obligations | $ 2,000 | $ 18,100 |
Discontinued Operations, Disposed of by Sale | True Health |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Accounts receivable, net, after gross-up |  |  | 3,400
Deferred revenue |  |  | $ 4,140

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