Stock-Based Compensation Expense (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2022

Dec. 31, 2021

Share-Based Payment Arrangement [Abstract]

Summary of Share-Based Payment Arrangement, Option, Activity

The following table summarizes the stock option activity for the six months ended June 30, 2022:

	Options outstanding
	Number of shares			Weighted average exercise price per share		Weighted average contractual term (in years)		Aggregate intrinsic value (in thousands)
Outstanding - December 31, 2021		197,637		$	138.20			$	15,398
Options granted		—			—
Options exercised		(9,892	)		5.96
Options cancelled		(3,116	)		139.71
Options expired		—			—
Outstanding at June 30, 2022		184,629		$	144.51		4.76	$	73
Vested and exercisable - June 30, 2022		169,161		$	134.35		4.53	$	73
Vested and expected to vest - June 30, 2022		184,629		$	144.51		4.76	$	73

A summary of option activity under the Plan is as follows:

	Options outstanding
	Number of shares			Weighted average exercise price per share		Weighted average contractual term (in years)		Aggregate intrinsic value (in thousands)
Outstanding - December 31, 2019		221,756		$	205.16		6.99	$	55,114
Options granted		96,166			255.00
Options exercised		(1,549	)		22.11
Options cancelled		(101,393	)		389.18
Options expired		(1,831	)		214.07
Outstanding at December 31, 2020		213,149			141.25		6.44		6,237
Options granted		—			—
Options exercised		(3,878	)		19.07
Options cancelled		(7,727	)		221.55
Options expired		(3,907	)		255.00
Outstanding at December 31, 2021		197,637			138.20		5.13		13,165
Vested and exercisable - December 31, 2021		173,836		$	122.17		4.78	$	13,165
Vested and expected to vest - December 31, 2021		197,637		$	138.20		5.13	$	13,165

Summary of Fair Value of Stock-Based Compensation

The following assumptions were used to calculate the fair value of stock-based compensation:

	Years ended December 31,
	2021	2020
Expected term	0.5 – 6.5 years	0.5 – 6.5 years
Expected volatility	40.4% – 63.6%	40.4% – 63.6%
Risk-free interest rate	0.1% – 3.1%	0.1% – 1.5%
Expected dividends	0.0%	0.0%

Summary of Share-Based Payment Arrangement, Restricted Stock And Restricted Stock Unit, Activity

The following table summarizes the restricted stock unit activity for the six months ended June 30, 2022:

	Restricted Stock Units (“RSUs”)
	Number of shares			Weighted average grant date fair value
Outstanding as of December 31, 2021		565,005		$	137.94
Granted		278,853			29.95
Vested		(393,737	)		129.48
Forfeited or cancelled		(13,554	)		136.19
Outstanding as of June 30, 2022		436,567		$	76.29

The following tables summarize the restricted stock activity under the Plan:

	Restricted Stock Units (“RSUs”)
	Number of shares			Weighted average grant date fair value
Outstanding as of December 31, 2019		—		$	—
Granted		302,904			83.97
Vested		—			—
Forfeited or cancelled		(7,842	)		83.97
Outstanding as of December 31, 2020		295,062			83.97
Granted		283,695			145.67
Vested		—			—
Forfeited or cancelled		(13,752	)		132.48
Outstanding as of December 31, 2021		565,005		$	137.94

	Restricted Stock Awards (“RSAs”)
	Number of shares			Weighted average grant date fair value
Outstanding as of December 31, 2020		—		$	—
Granted		58,199			130.21
Vested		(58,199	)		130.21
Forfeited or cancelled		—			—
Outstanding as of December 31, 2021		—		$	—

Summary of Share-Based Payment Arrangement, Expensed And Capitalized, Amount

The following table summarizes stock-based compensation expense and its allocation within the accompanying condensed consolidated statements of operations for the three and six months ended June 2022 and 2021, respectively (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Cost of goods sold	$	154	$	21	$	837	$	41
Research and development		1,464		455		9,141		896
Sales and marketing		1,244		230		5,842		442
General and administrative		2,389		5,019		40,992		5,927
Total stock-based compensation expense	$	5,251	$	5,725	$	56,812	$	7,306

The following table summarizes stock-based compensation expense and its allocation within the accompanying consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2021		2020
Cost of goods sold	$	193	$	100
Research and development		1,717		2,225
Sales and marketing		858		1,294
General and administrative		9,204		1,824
Total stock-based compensation expense	$	11,972	$	5,443