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EQUITY PLANS AND SHARE-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 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 8,2901.22 
Canceled(1,892)8.31 
Expired(358)6.52 
Outstanding at June 30, 202516,549$6.57 
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 
Granted11,814 — 1.25 — 
Vested(4,179)— 9.34 — 
Forfeited(2,939)— 4.01 — 
Outstanding at June 30, 202518,907 392 $3.67 $9.43 
Schedule of Stock-Based Compensation Expense
The following table summarizes share-based compensation expense:
Three Months Ended June 30,Six Months Ended June 30,
(In thousands)
2025202420252024
Cost of revenue$925 $1,131 $2,090 $3,237 
Research and development 3,307 4,591 5,914 10,379 
Sales, general and administrative7,663 11,497 13,092 23,128 
Total share-based compensation expense$11,895 $17,219 $21,096 $36,744 
Schedule of Fair Value of Employee Stock Options
The fair value of employee stock options was estimated using the following assumptions:
Six Months Ended June 30,
20252024
Expected term in years4.94.9
Expected volatility
 95% — 96%
81% — 89%
Risk-free interest rate
 3.89% — 4.29%
4.20% — 4.32%
Dividend yield
Weighted average grant date fair value per share$0.90$1.43
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:
Six Months Ended June 30,
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