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STOCK-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
A summary of the stock option activity for the six months ended June 30, 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 June 30, 20230.7 $13.38 
Options exercisable at June 30, 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 six months ended June 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, 20223.7 $25.08 
RSUs granted2.0 $24.07 
Less:
RSUs vested(0.7)$26.42 
RSUs canceled(0.2)$24.95 
RSUs unvested and outstanding at June 30, 20234.8 $24.47 
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
June 30,
Six months ended
June 30,
(in millions)2023202220232022
Cost of testing revenue$0.4 $0.5 $0.7 $0.8 
Research and development expense1.1 1.0 1.7 3.4 
Selling, general, and administrative expense9.7 8.9 16.3 16.3 
     Total stock-based compensation expense$11.2 $10.4 $18.7 $20.5