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Stock Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Summary of Activity Relating to the Company's Options to Purchase Common Stock
The following table summarizes the activity relating to the Company’s options to purchase common stock for the year ended December 31, 2023:
Weighted-Average
Weighted-AverageRemaining
Number ofExercise PriceContractualAggregate
OptionsPer ShareTerm (Years)Intrinsic Value
(in thousands)
Outstanding at December 31, 20223,842,737 $27.75 4.86$1,658 
Granted1,550,200 $3.53 
Forfeited or cancelled (vested and unvested)(1,706,746)$35.69 
Outstanding at December 31, 20233,686,191 $13.88 7.47$584 
Vested and expected to vest at December 31, 20233,686,191 $13.88 7.47$584 
Exercisable at December 31, 20231,706,622 $23.99 5.84$20 
The following table summarizes the activity relating to the Company’s performance-based stock options for the year ended December 31, 2023:
Weighted-Average
Weighted-AverageRemaining
Number ofExercise PriceContractualAggregate
PBSOsPer ShareTerm (Years)Intrinsic Value
(in thousands)
Outstanding at December 31, 2022499,200 $6.73 9.32$12 
Granted227,900 $1.62 
Forfeited(65,250)$6.76 
Outstanding at December 31, 2023661,850 $4.97 8.63$312 
Vested and expected to vest at December 31, 2023661,850 $4.97 8.63$312 
Exercisable at December 31, 202348,100 $8.94 5.87$— 
Schedule of Weighted-Average Assumptions Used to Compute the Stock-Based Compensation Costs for the Stock Options Granted to Employees
The following table shows the weighted-average assumptions used to compute the stock-based compensation costs for the stock options granted to employees during each of the two years ending December 31, 2023, using the Black-Scholes option-pricing model:
Year ended
December 31,
20232022
Risk-free interest rate3.83 %2.26 %
Dividend yield— — 
Weighted-average expected life of options (years)6.176.16
Volatility79 %81 %
Summary of Activity Relating to the Company's RSUs
The following table summarizes the activity relating to the Company’s RSUs for the year ended December 31, 2023:
Number ofWeighted-Average
RSUsFair Value Per Share
Outstanding and unvested at December 31, 20221,768,185 $8.80 
Granted2,456,485 $3.22 
Forfeited or expired(342,876)$7.14 
Vested(833,906)$8.07 
Outstanding and unvested at December 31, 20233,047,888 $4.69 
Schedule of Nonvested Performance-based Units Activity
The following table summarizes the activity relating to the Company's PBRSUs for the year ended December 31, 2023:
Numbers ofWeighted-Average
PBRSU'sFair Value Per Share
Outstanding and unvested at December 31, 2022461,250 $9.50 
Granted— $— 
Forfeited(100,250)$11.50 
Vested(200,725)$8.94 
Outstanding and unvested at December 31, 2023160,275 $8.94