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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | A summary of the stock option activity for the six months ended June 30, 2024 is as follows:
(number of shares in millions) | Number of Shares |  | Weighted Average Exercise Price
Options outstanding at December 31, 2023 | 0.7 |  |  | $ | 13.38 |
Options outstanding at June 30, 2024 | 0.7 |  |  | $ | 13.38 |
Options exercisable at June 30, 2024 | 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 six months ended June 30, 2024 is as follows:
(number of shares in millions) | Number of Shares |  | Weighted Average Grant Date Fair Value
RSUs unvested and outstanding at December 31, 2023 | 4.4 |  |  | $ | 24.37 |
RSUs granted | 2.4 |  |  | $ | 22.29 |
Less: |  |  |
RSUs vested | (1.2) |  |  | $ | 25.10 |
RSUs canceled | (0.1) |  |  | $ | 23.64 |
RSUs unvested and outstanding at June 30, 2024 | 5.5 |  |  | $ | 23.29 |
Schedule of Shares Purchased and Compensation Expense | Shares purchased under, and compensation expense associated with, the Amended and Restated 2012 Purchase Plan for the six months ended June 30, 2024 and 2023 are as follows:
| Three months ended June 30, | Six months ended June 30,
(in millions) | 2024 |  |  | 2023 |  | 2024 |  |  | 2023
Shares purchased under the plan | 0.2 |  |  |  | 0.2 |  |  | 0.2 |  |  |  | 0.2
Plan compensation expense | $ | 0.5 |  |  |  | $ | 0.7 |  |  | $ | 1.0 |  |  |  | $ | 1.2 |
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) | 2024 |  |  | 2023 |  | 2024 |  |  | 2023
Cost of testing revenue | $ | 0.4 |  |  |  | $ | 0.4 |  |  | $ | 0.7 |  |  |  | $ | 0.7 |
Research and development expense | 1.6 |  |  |  | 1.1 |  |  | 2.8 |  |  |  | 1.7 |
Selling, general, and administrative expense | 12.5 |  |  |  | 9.7 |  |  | 23.0 |  |  |  | 16.3 |
Total stock-based compensation expense | $ | 14.5 |  |  |  | $ | 11.2 |  |  | $ | 26.5 |  |  |  | $ | 18.7 |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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