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STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 11.6 | $ 9.4 | $ 30.3 | $ 29.9
Cost of testing revenue |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 0.4 | 0.5 | 1.1 | 1.3
Research and development expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 1.2 | 1.0 | 2.9 | 4.4
Selling, general, and administrative expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 10.0 | $ 7.9 | $ 26.3 | $ 24.2

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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 + Details
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