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Organization and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Other-than-temporary impairments | $ 0 |  | $ 0 |  | $ 0 | $ 0
Unamortized software costs | 2,300,000 |  | 6,700,000 | $ 2,300,000 |  |
Amortization expense for capitalized software | 0 |  | 200,000 |  | 0 | 0
Advance Medicare payments to provide relief from economic impacts of COVID-19 |  |  |  |  | 29,700,000 |
Revenue increase (decrease) due to changes in estimated transaction price due to contractual adjustments |  |  | 15,900,000 |  | 9,900,000 |
Revenue recognized due to expanded local coverage determination for which revenue was previously constrained |  |  | 6,800,000 |  |  |
Accrued liability for Medicare refund | 9,400,000 |  | 19,300,000 | 9,400,000 |  |
Revenues | 299,800,000 | $ 381,400,000 | 690,600,000 | $ 557,100,000 | 638,600,000 | 851,100,000
Capitalized costs incurred to obtain or fulfill contract |  |  | 0 |  |  |
Net gain on divestiture | $ 0 |  | $ 162,000,000 |  | 1,000,000 | $ 0
Provider fund relief under CARES Act |  |  |  |  | $ 14,600,000 |
Immaterial prior period Medicare claims |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Change in earnings (loss) per share (dollars per share) |  |  |  |  | $ (0.05) |
Accrued liability for Medicare refund |  |  |  |  | $ 4,700,000 |
Revenues |  |  |  |  | $ (4,700,000) |
Performance obligation estimate |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Change in earnings (loss) per share (dollars per share) |  |  | $ 0.15 |  | $ (0.10) |
Equipment | Minimum |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Estimated useful lives (in years) |  |  | 5 years |  |  |
Equipment | Maximum |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Estimated useful lives (in years) |  |  | 7 years |  |  |
Leasehold improvements | Minimum |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Estimated useful lives (in years) |  |  | 1 year |  |  |
Leasehold improvements | Maximum |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Estimated useful lives (in years) |  |  | 7 years |  |  |
Government contracts concentration risk | Medicare | Revenue |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |  |
Concentration risk (percent) | 16.00% |  | 17.00% |  | 15.00% | 14.00%

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