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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2023
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, 20222,599,264 $8.41 7.2$— 
Granted— — — — 
Exercised — — — — 
Forfeited and cancelled(102,770)$22.14 — — 
Balance – June 30, 20232,496,494 $7.85 6.3$— 
Exercisable – June 30, 20232,260,042 $7.40 6.1$— 
Vested and expected to vest as of June 30,20232,496,494 $7.85 6.3$— 
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, 20222,058,534 $12.79 
Granted— — 
Vested(817,978)13.11 
Forfeited(174,275)20.23 
Unvested and outstanding balance at June 30, 20231,066,281 $11.32 
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,
2023202220232022
Cost of sales (1)
$(826)$764 $(453)$1,643 
Selling and administrative expenses (2)
3,977 3,983 8,823 9,643 
Total$3,151 $4,747 $8,370 $11,286 
(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. 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 and recorded in cost of sales for the three and six months ended June 30, 2022 were $0.6 million and $0.7 million, respectively.
(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.