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STOCK-BASED COMPENSATION
 3 Months Ended
Mar. 31, 2025
Share-Based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
On November 30, 2017, the Company’s stockholders approved the adoption of the 2017 Employee, Director and Consultant Equity Incentive Plan (as amended, the “2017 Plan”). The 2017 Plan allows the Company, under the direction of the Compensation and Human Capital Committee (the "CHCC") of the Board of Directors of the Company, to make grants of restricted and unrestricted stock and stock unit awards to employees, consultants and directors. Stockholders have subsequently approved amendments to the 2017 Plan increasing the shares available to grant thereunder, including most recently at the Company's annual meeting of stockholders held on June 1, 2023, when stockholders approved an amendment to the 2017 Plan to increase the aggregate number of shares of common stock available thereunder for the granting of awards by an additional 4.8 million shares. As of March 31, 2025, the Company had 0.9 million shares of common stock available for grant under the 2017 Plan. If an RSU awarded under the 2017 Plan is cancelled or forfeited without the issuance of shares of common stock, the unissued shares that were subject to the RSU will again be available for issuance pursuant to the 2017 Plan.
The number of shares, terms, and vesting periods are generally determined by the Company’s Board of Directors or the CHCC on an award-by-award basis. RSUs granted to employees generally vest either ratably over three or four years or as cliff vesting after three years either on the anniversary of the date on which the RSUs were granted or during the month in which such anniversary dates occur. The number of PSUs awarded to certain employees may be increased or reduced based on certain additional performance and market metrics. RSUs granted to non-employee directors generally vest in full upon the earlier of the completion of one year of service following the date of the grant or the date of the next annual meeting of stockholders following such grant.
Stock Options
A summary of the stock option activity for the three months ended March 31, 2025 is as follows:
(number of shares in millions)Number
of
Shares		Weighted
Average
Exercise
Price
Options outstanding at December 31, 20240.7 $13.38 
Options outstanding at March 31, 20250.7 $13.38 
Options exercisable at March 31, 20250.5 $13.38 
As of March 31, 2025, there was no unrecognized stock-based compensation expense. There were no options granted during the three months ended March 31, 2025.
Restricted Stock Units
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, 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, 20245.3 $23.66 
RSUs granted1.6 $9.72 
Less:
RSUs vested(1.5)$25.46 
RSUs canceled(0.3)$22.80 
RSUs unvested and outstanding at March 31, 20255.1 $16.80 
Employee Stock Purchase Plan
The Company also has an Employee Stock Purchase Plan that was initially approved by stockholders in 2012 and was amended and approved by the Board of Directors on September 23, 2021 and the stockholders of the Company on June 2, 2022 (the "Amended and Restated 2012 Purchase Plan"), under which 4.0 million shares of common stock were authorized for issuance. Shares are issued under the Amended and Restated 2012 Purchase Plan twice yearly at the end of each offering period and the number of shares that may be purchased by any participant during an offering period is limited to 5,000 shares. The first offering period of 2025 started on December 1, 2024 and will end on May 31, 2025. The second offering period of 2025 will begin on June 1, 2025 and will end on November 30, 2025. As of March 31, 2025, 0.9 million shares of common stock were available for issuance under the Amended and Restated 2012 Purchase Plan. Shares purchased under, and compensation expense associated with, the Amended and Restated 2012 Purchase Plan for the three months ended March 31, 2025 and 2024 are as follows:
Three months ended
March 31,
(in millions)20252024
Shares purchased under the plan
— — 
Plan compensation expense$0.5 $0.5 
Stock-Based Compensation Expense
Stock-based compensation expense recognized and included in the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) was allocated as follows:
Three months ended
March 31,
(in millions)20252024
Cost of revenue$0.3 $0.3 
Research and development expense2.1 1.2 
Sales and marketing expense1.5 1.9 
General and administrative expense5.6 8.6 
Total stock-based compensation expense$9.5 $12.0 
As of March 31, 2025, there was $64.0 million of total unrecognized stock-based compensation expense related to RSUs that is expected to be recognized over a weighted-average period of 2.1 years. The Company recognizes forfeitures as they occur. In the event that a PSU is determined to be improbable of vesting, the Company records an adjustment to reverse all previously recognized expense associated with the equity award in the current period.