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Revenue Recognition - Contract Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]      
Short-term receivables $ 240,060 $ 240,060 $ 124,064
Long-term receivables 4,688 4,688 4,554
Short-term contract assets 0 0 329
Short-term deferred revenue 13,173 13,173 10,187
Long-term deferred revenue 4,932 4,932 3,593
Deferred revenue      
Balance as of beginning-of-period   13,780  
Reclassification to revenue, as a result of performance obligations satisfied   (8,726)  
Cash received in advance of satisfaction of performance obligations   13,051  
Balance as of end of period 18,105 18,105  
Revenue recognized from performed obligations $ 2,900 $ 16,100  
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