Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Options Activity

The following is a summary of stock option activity during the six months ended June 30, 2022:

	Options Outstanding
	Number of Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (years)		Aggregate Intrinsic Value
Balance—January 1, 2021		522,905		$	9.25		6.77	$	25,971
Options granted		—		$	—		—	$	—
Options exercised		—		$	—		—	$	—
Options cancelled		(154,309	)	$	9.24		—	$	—
Balance—June 30, 2022		368,596		$	9.26		6.31	$	—
Exercisable as of June 30, 2022		368,457		$	9.26		6.31	$	—
Vested and expected to vest as of June 30, 2022		368,596		$	9.26		6.31	$	—

Summary of Restricted Stock Award Activity

A summary of restricted stock award activity within the Company’s equity plans and changes for the six months ended June 30, 2022 is as follows:

Restricted Stock Awards	Shares			Weighted Average Grant- Date Fair Value
Nonvested at January 1, 2022		2,106,180		$	14.94
Granted		4,020,674		$	3.24
Vested		(1,466,063	)	$	8.81
Forfeited		(201,596	)	$	15.89
Nonvested at June 30, 2022		4,459,195		$	5.77

Summary of Total Stock-based Compensation Expense by Function

The following table summarizes the total stock-based compensation expense by function, including expense related to consultants, for the three and six months ended June 30, 2021 and 2022:

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2022		2021		2022
	(in thousands)				(in thousands)
Sales and distribution expenses	$	1,569	$	2,882	$	2,524	$	3,229
Research and development expenses		1,221		633		2,104		907
General and administrative expenses		2,072		2,533		7,132		4,777
Total stock-based compensation expense	$	4,862	$	6,048	$	11,760	$	8,913