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STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	$ 11.2	$ 10.4	$ 18.7	$ 20.5
Cost of testing revenue
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	0.4	0.5	0.7	0.8
Research and development expense
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	1.1	1.0	1.7	3.4
Selling, general, and administrative expense
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	$ 9.7	$ 8.9	$ 16.3	$ 16.3

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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

No definition available.

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- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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