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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