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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Stock Option Activity

A summary of the stock option activity for the nine months ended September 30, 2023 is as follows:

(number of shares in millions)			Number of Shares						Weighted Average Exercise Price
Options outstanding at December 31, 2022			0.7						$	13.38
Less:
Options exercised			—						$	—
Options canceled or expired			—						$	—
Options outstanding at September 30, 2023			0.7						$	13.38
Options exercisable at September 30, 2023			0.5						$	13.38

Schedule of Restricted Stock Unit Activity

A summary of the RSU awards activity under the Company’s equity plan and inducement awards, including PSU awards, for the nine months ended September 30, 2023 is as follows:

(number of shares in millions)			Number of Shares						Weighted Average Grant Date Fair Value
RSUs unvested and outstanding at December 31, 2022			3.7						$	25.08
RSUs granted			2.1						$	23.57
Less:
RSUs vested			(1.0)						$	24.95
RSUs canceled			(0.2)						$	24.95
RSUs unvested and outstanding at September 30, 2023			4.6						$	24.41

Schedule of Shares Purchased and Compensation Expense

Shares purchased under, and compensation expense associated with, the Amended and Restated 2012 Purchase Plan for the three and nine months ended September 30, 2023 and 2022 are as follows:

			Three months ended September 30,												Nine months ended September 30,
(in millions)			2023						2022						2023						2022
Shares purchased under the plan			—						—						0.2						0.2
Plan compensation expense			$	0.5					$	0.5					$	1.7					$	1.4

Schedule of Stock-Based Compensation Expense

Stock-based compensation expense recognized and included in the Condensed Consolidated Statements of Operations and Comprehensive Loss was allocated as follows:

			Three months ended September 30,															Nine months ended September 30,
(in millions)			2023									2022						2023									2022
Cost of testing revenue			$	0.4								$	0.5					$	1.1								$	1.3
Research and development expense			1.2									1.0						2.9									4.4
Selling, general, and administrative expense			10.0									7.9						26.3									24.2
Total stock-based compensation expense			$	11.6								$	9.4					$	30.3								$	29.9

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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