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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | A summary of the stock option activity for the nine months ended September 30, 2025 is as follows:
(number of shares in millions) | Number of Shares |  | Weighted Average Exercise Price
Options outstanding at December 31, 2024 | 0.7 |  |  | $ | 13.38 |
Options outstanding at September 30, 2025 | 0.7 |  |  | $ | 13.38 |
Options exercisable at September 30, 2025 | 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, 2025 is as follows:
(number of shares in millions) | Number of Shares |  | Weighted Average Grant Date Fair Value
RSUs unvested and outstanding at December 31, 2024 | 5.3 |  |  | $ | 23.66 |
RSUs granted | 4.5 |  |  | $ | 6.75 |
Less: |  |  |
RSUs vested | (1.7) |  |  | $ | 25.17 |
RSUs canceled | (0.6) |  |  | $ | 16.29 |
RSUs unvested and outstanding at September 30, 2025 | 7.5 |  |  | $ | 12.11 |
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, 2025 and 2024 are as follows:
| Three months ended September 30, | Nine months ended September 30,
(in millions) | 2025 |  |  | 2024 |  | 2025 |  |  | 2024
Shares purchased under the plan | — |  |  |  | — |  |  | 0.7 |  |  |  | 0.2 |
Plan compensation expense | $ | 0.1 |  |  |  | $ | 0.5 |  |  | $ | 0.9 |  |  |  | $ | 1.6 |
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) | 2025 |  |  | 2024 |  | 2025 |  |  | 2024
Cost of revenue | $ | 0.3 |  |  |  | $ | 0.4 |  |  | $ | 0.9 |  |  |  | $ | 1.2 |
Research and development expense | 2.0 |  |  |  | 1.6 |  |  | 6.1 |  |  |  | 4.4 |
Sales and marketing expense | 2.1 |  |  |  | 2.4 |  |  | 5.6 |  |  |  | 6.8 |
General and administrative expense | 7.8 |  |  |  | 8.0 |  |  | 19.8 |  |  |  | 26.5 |
Total stock-based compensation expense | $ | 12.2 |  |  |  | $ | 12.4 |  |  | $ | 32.4 |  |  |  | $ | 38.9 |

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- Definition 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. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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