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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 |

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