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Revision of Prior Period Financial Statements - Schedule of Revised Consolidated Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities      
Net loss $ (43,830) $ (54,568) $ (50,378)
Adjustments to reconcile net loss to net cash used in operating activities:      
Provision for bad debt and contractual allowances     16,448
Accounts receivable 37,957 28,725 21,747
Accrued liabilities 1,308 6,002 10,501
Deferred revenue (321) 28 (15)
Net cash used in operating activities (13,759) (21,863) (29,093)
Cash flows from investing activities      
Purchases of available-for-sale investments 277,510 165,915 93,133
Net cash provided by investing activities $ (132,391) $ (89,274) 34,142
As Reported      
Cash flows from operating activities      
Net loss     (48,280)
Adjustments to reconcile net loss to net cash used in operating activities:      
Provision for bad debt and contractual allowances     15,218
Accounts receivable     22,885
Accrued liabilities     10,776
Deferred revenue     5
Net cash used in operating activities     (29,068)
Cash flows from investing activities      
Purchases of available-for-sale investments     93,158
Net cash provided by investing activities     34,117
Adjustment      
Cash flows from operating activities      
Net loss     (2,098)
Adjustments to reconcile net loss to net cash used in operating activities:      
Provision for bad debt and contractual allowances     1,230
Accounts receivable     (1,138)
Accrued liabilities     (275)
Deferred revenue     (20)
Net cash used in operating activities     (25)
Cash flows from investing activities      
Purchases of available-for-sale investments     (25)
Net cash provided by investing activities     $ 25