Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation Expense

Stock-based compensation expense is as follows (in thousands):

	Three Months Ended September 30,
	2023		2022
Selling, general and administrative expense	$	2,454	$	3,908
Research and development expense	3,252		7,258
Production expense	420		—
Total	$	6,126	$	11,166

	Nine Months Ended September 30,
	2023		2022
Selling, general and administrative expense	$	5,407	$	6,099
Research and development expense	7,683		11,327
Production expense	420		—
Total	13,510		17,426

Schedule of Stock Option Activity

The following table summarizes option activity under the Plan:

	Options	Weighted Average Exercise Price	Weighted Average Contractual Term (in Years)
Balance as of December 31, 2022	17,679,596	1.51	4.7
Granted	7,000	7.05
Exercised	(60,340)	0.44
Forfeited	(242,841)	13.49
Balance as of September 30, 2023	17,383,415	1.35	3.9

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The fair value of each stock option grant under the Plan was estimated on the date of grant using the Black-Scholes option pricing model, with the following range of assumptions:

	Nine Months Ended September 30, 2023
Expected term (in years)	6.3
Volatility	74.5% to 75.2%
Dividend yield	0.0%
Risk-free interest rate	3.40% to 4.00%
Common stock price	$6.98 to $7.10

Schedule of RSU Activity

The following table summarizes RSU activity under the Plan:

	RSU Awards	Weighted Average Grant Date Fair Value
Unvested as of December 31, 2022	11,752	$	12.45
Awarded	2,282,921	5.84
Vested	(227,627)	12.27
Forfeited	(189,994)	10.02
Unvested as of September 30, 2023	1,877,052	$	8.21