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STOCK-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
A summary of the stock option activity for the three months ended March 31, 2023 is as follows:
(number of shares in millions)Number
of
Shares
Weighted
Average
Exercise
Price
Options outstanding at December 31, 20220.7 $13.38 
Less:
Options exercised— $— 
Options canceled or expired— $— 
Options outstanding at March 31, 20230.7 $13.38 
Options exercisable at March 31, 20230.4 $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 three months ended March 31, 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, 20223.7 $25.08 
RSUs granted1.8 $24.19 
Less:
RSUs vested(0.6)$28.07 
RSUs canceled— $25.42 
RSUs unvested and outstanding at March 31, 20234.9 $24.41 
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
March 31,
(in millions)20232022
Cost of testing revenue$0.3 $0.3 
Research and development expense0.6 2.4 
Selling, general, and administrative expense6.6 7.4 
     Total stock-based compensation expense$7.5 $10.1