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Equity Incentive Plans (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
The following table summarizes stock option activity during the six months ended June 30, 2024:
Shares Subject to
Options Outstanding
Weighted-
Average
 
SharesWeighted-
Average
Exercise
Price
Remaining
Contractual
Life
(Years)
Aggregate
Intrinsic Value
(in thousands)
Outstanding as of December 31, 202323,626,115 $2.52 7.9$369 
Options granted12,257,228 $0.96 
Options exercised— $— 
Options forfeited/cancelled(692,668)$1.64 
Outstanding as of June 30, 202435,190,675 $1.99 8.1$580 
Options vested and expected to vest as of June 30, 202435,190,675 $1.99 8.1$580 
Options exercisable as of June 30, 202411,739,966 $3.64 6.2$
Schedule of Restricted Stock Activity
The summary of the Company’s restricted stock activity during the six months ended June 30, 2024 is as follows:
Number of
Restricted
Stock Units
Outstanding
Weighted-
Average
Grant Date
Fair Value
Nonvested at December 31, 2023427,698 $10.92 
Granted— — 
Vested(427,698)10.92 
Forfeited— — 
Nonvested at June 30, 2024— $— 
Schedule of Stock-Based Compensation Expense Reported in Condensed Consolidated Statements of Operations
Stock-based compensation expense has been reported in the Company’s condensed consolidated statements of operations and comprehensive loss as follows (in thousands):
Three months ended June 30,Six months ended June 30,
2024202320242023
Research and development$2,495 $4,721 $5,423 $9,411 
General and administrative2,506 3,476 5,389 6,913 
Total stock-based compensation expense$5,001 $8,197 $10,812 $16,324