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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
A summary of the stock option activity under our equity incentive plans is as follows:
Number of OptionsWeighted- Average Exercise PriceWeighted- Average Remaining Contractual Term (years)Aggregate Intrinsic Value (in thousands)
Balance – December 31, 20232,291,328 $2.49 6.4$311 
Granted— — — — 
Exercised — — — — 
Forfeited, expired and cancelled(293,862)5.05 — — 
Balance – June 30, 20241,997,466 $2.12 6.8$107 
Exercisable – June 30, 20241,540,180 $2.55 6.1$54 
Vested and expected to vest as of June 30, 20241,997,466 $2.12 6.8$107 
Schedule of Restricted Stock Unit Activity
A summary of restricted stock unit activity under our equity incentive plans is as follows:
Number of AwardsWeighted- Average Grant Date Fair Value per Share
Unvested and outstanding balance at December 31, 20233,214,910 $2.91 
Granted— — 
Vested(1,584,097)3.08 
Forfeited(26,578)3.11 
Unvested and outstanding balance at June 30, 20241,604,235 $2.74 
Schedule of Performance Stock Unit Activity
A summary of performance-based restricted stock unit (“PSU”) activity under our 2021 Plan is as follows:

Number of
awards		Weighted-
average grant
date fair value
per share
Unvested and outstanding balance at December 31, 2023707,655 $10.8 
Granted— — 
Vested (1)
(317,828)16.93 
Forfeited— — 
Unvested and outstanding balance at June 30, 2024389,827 $5.80 
(1) Relates to PSUs that were modified in the fourth quarter of 2023 to change the unvested shares underlying the original awards to time-based vesting.
Schedule of Allocated Share-based Compensation Expense
Stock-based compensation expense under our equity incentive plans was as follows (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2024202320242023
Cost of sales (1)
$— $(826)$633 $(453)
Selling and administrative expenses (2)
2,005 3,977 3,206 8,823 
Total$2,005 $3,151 $3,839 $8,370 
(1)    Cost of sales for the three and six months ended June 30, 2023 includes a net reversal of $1.1 million of stock-based compensation expense associated with equity awards granted to an independent contractor for services pursuant to the terms of a license, services and collaboration agreement. The contract with such independent contractor expired in the fourth quarter of 2023, and there was no related stock-based compensation expense recorded for the three and six months ended June 30, 2024.
(2)    Selling and administrative expenses for the three and six months ended June 30, 2023 includes $1.3 million and $2.3 million of accelerated amortization of stock-based compensation expense for certain equity awards during the three and six months ended June 30, 2023, respectively.