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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of employee and nonemployee stock option activity
A summary of the Company’s employee and nonemployee stock option activities for the three months ended March 31, 2024 is presented below:
Shares Weighted
Average
Exercise
Price 		Weighted
Average
Remaining
Contract
Term
(in years)		Aggregate
Intrinsic
Value
(in thousands)
Outstanding as of December 31, 2023
1,258,483 $19.22 4.5$767 
Granted— $— 
Exercised— $— 
Expired/Forfeited(152,810)$36.34 
Outstanding as of March 31, 2024
1,105,673 $16.86 4.78$637 
Exercisable as of March 31, 2024
1,026,554 $14.44 4.60$637 
Vested and expected to vest as of March 31, 2024
1,105,673 $16.86 4.78$637 
Schedule of stock based compensation expense related to options granted to employees and non employees
For the three months ended March 31, 2024 and 2023, the Company recorded stock-based compensation expense as follows (in thousands):
Three Months Ended
March 31,
20242023
Cost of revenue$11 $60 
Research and development expense788 1,177 
Selling, general and administrative expense127 1,052 
Total stock-based compensation expense$926 $2,289 
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
A summary of the Company’s RSU activities for the three months ended March 31, 2024 is presented below:
SharesWeighted Grant Date Fair Value
Outstanding as of December 31, 2023
608,029 $16.36 
Granted8,000 $2.62 
Released(82,951)$12.10 
Forfeited(84,714)$20.17 
Outstanding as of March 31, 2024
448,364 $16.19