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Summary of Significant Accounting Policies - Schedule of Changes in Contractual Allowance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]
Balance, beginning of period	$ 10,601	$ 7,444	$ 7,444	$ 7,444	$ 7,444
Add: allowance for contractual adjustments	3,881	2,355	4,649	6,256	9,392
Less: contractual adjustments	(1,435)	18	(3,072)	(3,056)	(6,235)
Balance, end of period	$ 13,047	9,817	9,021	10,644	10,601
As reported
Accounts Notes And Loans Receivable [Line Items]
Balance, beginning of period		7,444	7,444	7,444	$ 7,444
Add: allowance for contractual adjustments		989	2,618	3,004
Less: contractual adjustments		18	(3,072)	(2,467)
Balance, end of period		$ 8,451	$ 6,990	$ 7,981