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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Concentration of Credit Risk
Cash and cash equivalents, federal government agency insured limit	$ 529.0
Revenue | Customer Concentration Risk | Centers for Medicare and Medicaid Services
Concentration of Credit Risk
Concentration risk (as a percent)	17.00%	14.00%	20.00%
Revenue | Customer Concentration Risk | UnitedHealthcare
Concentration of Credit Risk
Concentration risk (as a percent)	12.00%	12.00%	11.00%
Revenue | Customer Concentration Risk | State of Wisconsin
Concentration of Credit Risk
Concentration risk (as a percent)	0.00%	3.00%	8.00%
Accounts Receivable | Customer Concentration Risk | Centers for Medicare and Medicaid Services
Concentration of Credit Risk
Concentration risk (as a percent)	10.00%	14.00%	11.00%
Accounts Receivable | Customer Concentration Risk | UnitedHealthcare
Concentration of Credit Risk
Concentration risk (as a percent)	10.00%	9.00%	8.00%
Accounts Receivable | Customer Concentration Risk | State of Wisconsin
Concentration of Credit Risk
Concentration risk (as a percent)	0.00%	5.00%	9.00%

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- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
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