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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, 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 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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