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STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 14.5 | $ 11.2 | $ 26.5 | $ 18.7
Cost of testing revenue |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 0.4 | 0.4 | 0.7 | 0.7
Research and development expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 1.6 | 1.1 | 2.8 | 1.7
Selling, general, and administrative expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 12.5 | $ 9.7 | $ 23.0 | $ 16.3

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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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