Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2022

Share-Based Payment Arrangement [Abstract]

Fair Value of Stock Options Granted

The following table presents information about the fair value of stock options granted:

	Nine months ended September 30,
	2022		2021
Weighted average grant date fair value	$	1.02	$	1.78
Assumptions used to determine fair value:
Range of expected option life	5.5 - 6.0 years		5.5 - 6.0 years
Expected volatility	79 - 81%		79 - 81%
Risk-free interest rate	1.5 - 4.0%		0.7 - 1.2%
Expected dividend yield		—		—

Summary of Stock Option Activity

The following table presents information about stock option balances and activity:

	Number of shares			Weighted average exercise price		Aggregate intrinsic value		Weighted average remaining contractual life
Balance, December 31, 2021		5,267,567		$	6.47			5.7 years
Granted		3,984,673			1.49
Exercised		(220	)		1.71
Exchanged		(668,009	)		9.79
Forfeited or expired		(467,119	)		4.21
Balance, September 30, 2022		8,116,892			3.88	$	—	6.9 years
Exercisable		3,790,050			6.27		—	4.4 years

Summary of Restricted Stock Units Activity

The following table presents information about recent RSU activity:

	Number of shares			Weighted average grant date fair value
Balance, December 31, 2021		990,065		$	3.63
Granted		1,552,590			1.32
Exchanged		167,094			0.80
Vested		(506,015	)		3.67
Forfeited		(58,068	)		2.47
Balance, September 30, 2022		2,145,666			1.76

Summary of Stock Based Compensation Expense

The following table presents the classification of stock-based compensation expense:

	Three months ended September 30,				Nine months ended September 30,
	2022		2021		2022		2021
Cost of sales	$	428	$	706	$	1,427	$	3,081
Selling, general and administrative expenses		832		613		2,720		3,300
Total	$	1,260	$	1,319	$	4,147	$	6,381