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STOCKHOLDERS’ EQUITY (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Summary 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, 202313,011$10.63 
Granted 3932.06 
Exercised (515)3.15 
Canceled(582)11.36 
Expired
(150)6.18 
Outstanding at June 30, 202412,157$10.69 
Summary of Time-Based RSUs 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, 202311,308 541 $12.06 $9.43 
Granted12,501 — 5.07 — 
Vested(3,038)— 12.98 — 
Forfeited(4,118)(39)8.39 9.43 
Outstanding at June 30, 202416,653 502 $7.55 $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)2024202320242023
Cost of revenue$1,131 $1,177 $3,237 $3,126 
Research and development 4,591 5,423 10,379 12,128 
Sales, general and administrative11,497 11,291 23,128 20,589 
Total share-based compensation expense$17,219 $17,891 $36,744 $35,843 
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,
20242023
Expected term in years4.94.9
Expected volatility
 81% - 89%
78%
Risk-free interest rate
 4.20% - 4.32%
3.73%
Dividend yield
Weighted average grant date fair value per share$1.43$7.76
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,
20242023
Expected term in years
0.5 — 2.0
0.5 — 2.0
Expected volatility
81%
97%
Risk-free interest rate
4.54% — 5.27%
4.89% — 5.20%
Dividend yield
Weighted average grant date fair value per share$2.78$5.00