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SEQUITY PLANS AND SHARE-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
The following table summarizes stock option activity for time-based awards:
(shares in thousands)
Number
of shares
Weighted
average
exercise price
Outstanding at December 31, 202410,509$11.09 
Granted 7,5621.24 
Canceled(1,287)9.20 
Expired(236)6.91 
Outstanding at March 31, 202516,548$6.80 
Schedule of Time-Based RSUs and PSUs Activity The following table summarizes the time-based RSUs and PSUs activity:
Restricted Stock Units (RSU)Performance Stock Units (PSU)Weighted average grant date
fair value
(shares in thousands)
RSUPSU
Outstanding at December 31, 202414,211 392 $7.41 $9.43 
Granted11,618 — 1.25 — 
Vested(3,870)— 9.51 — 
Forfeited(552)— 5.79 — 
Outstanding at March 31, 202521,407 392 $3.73 $9.43 
Schedule of Stock-Based Compensation Expense
The following table summarizes share-based compensation expense:
Three Months Ended March 31,
(In thousands)
20252024
Cost of revenue$1,165 $2,106 
Research and development 2,607 5,788 
Sales, general and administrative5,429 11,631 
Total share-based compensation expense$9,201 $19,525 
Schedule of Fair Value of Employee Stock Options
The fair value of employee stock options was estimated using the following assumptions:
Three Months Ended March 31,
20252024
Expected term in years4.94.9
Expected volatility
 95% — 96%
81%
Risk-free interest rate
 3.92% — 4.29%
4.32%
Dividend yield
Weighted average grant date fair value per share$0.91$2.45
Schedule of Fair Value of Employee Stock Purchase Plan
The fair value of shares to be issued under the ESPP was estimated using the following assumptions:
Three Months Ended March 31,
20252024
Expected term in years
0.5 — 2.0
0.5 — 2.0
Expected volatility
113%
81%
Risk-free interest rate
3.96% — 4.31%
4.54% — 5.27%
Dividend yield
Weighted average grant date fair value per share$0.93$2.78