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Stock-Based Awards (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
The following table summarizes the Company’s stock option activity since December 31, 2021:
 
 Number of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
   (in years) 
Outstanding as of December 31, 20217,057,258 $6.59 6.98$4,678 
Granted1,734,500 3.75 
Exercised(208)1.76 
Forfeited(133,414)6.14 
Outstanding as of March 31, 20228,658,136 $6.03 7.21$1,058 
Options exercisable at March 31, 20224,984,439 $6.28 5.76$1,031 
Vested and expected to vest at March 31, 20228,658,136 $6.03 7.21$1,058 
The following table summarizes the Company’s stock option under the Inducement Plan activity since December 31, 2021:

Number of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
(in years)
Outstanding as of December 31, 2021— $— 0.00$— 
Granted98,000 3.64 
Exercised— — 
Forfeited— — 
Outstanding as of March 31, 202298,000 $3.64 9.92$— 
Options exercisable at March 31, 2022— $— 0.00$— 
Vested and expected to vest at March 31, 202298,000 $3.64 9.92$— 
Summary of Restricted Stock Unit Activity
The table below summarizes the Company’s RSU activity since December 31, 2021:
 
 Number of
Shares		Weighted
Average
Grant-Date
Fair Value
Unvested restricted stock units as of December 31, 2021— $— 
Granted732,000 3.64 
Vested— — 
Forfeited— — 
Unvested restricted stock units as of March 31, 2022732,000 $3.64 
Summary of Stock-Based Compensation Expense Related to Stock Options and Restricted Stock Awards
The Company recorded stock-based compensation expense related to stock options and restricted stock unit awards in the following expense categories of its condensed consolidated statements of operations and comprehensive income (loss):
 
 Three months ended March 31,
 20222021
Research and development expenses$584 $790 
General and administrative expenses1,281 1,590 
 $1,865 $2,380