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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |
Restricted cash | $ 8,800,000 | $ 9,500,000 | $ 1,400,000
Restricted cash, current | 1,200,000 | 2,000,000 |
Restricted cash, non current | $ 7,600,000 | 7,500,000 |
Lease extension term | 10 years |  |
Unamortized internal-use technology costs | $ 4,600,000 | 7,100,000 |
Revenue increase (decrease) due to changes in estimated transaction price due to contractual adjustments | 7,200,000 | 22,100,000 | 15,900,000
Revenue recognized due to expanded local coverage determination for which revenue was previously constrained |  |  | $ 6,800,000
Capitalized costs incurred to obtain or fulfill contract | 0 |  |
Foreign currency transaction (loss) gain | $ (3,400,000) | $ 200,000 |
Minimum |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |
Remaining lease terms | 1 year |  |
Maximum |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |
Remaining lease terms | 15 years |  |
Performance Obligation Estimate |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |
Change in earnings (loss) per share (in dollars per share) | $ 0.07 | $ 0.21 | $ 0.15
Internal-use software |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |
Unamortized software costs | $ 11,900,000 |  |
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) | 15 years |  |
Government Contracts Concentration Risk | Medicare | Revenue |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |
Concentration risk (in percent) | 12.00% | 14.00% | 17.00%
Medicare | Medicare | Accounts Receivable |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |
Concentration risk (in percent) | 12.00% |  |

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