Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Activity for Stock Option Plans

A summary of stock option activity for the three months ended March 31, 2022 is as follows:

	Number Outstanding			Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Balance as of December 31, 2021		514,693		$	5.11		4.11	$	11,850,930
Granted		—			—
Cancelled or Expired		(333	)		19.70
Exercised		—			—
Balance as of March 31, 2022		514,360		$	5.11		3.87	$	5,691,347
Vested or expected to vest as of March 31, 2022		514,360		$	5.11		3.87	$	5,691,347
Exercisable as of March 31, 2022		514,360		$	5.11		3.87	$	5,691,347

Summary Information about Options Outstanding

The following table summarizes information about stock options outstanding as of March 31, 2022:

	Stock Options Outstanding						Stock Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$4.36 - $7.20		452,510		4.12	$	4.41		452,510	$	4.41
$7.50 - $11.25		61,317		1.98		10.19		61,317		10.19
$11.30 - $16.95		500		2.00		11.30		500		11.30
$19.70 - $29.55		33		1.38		19.70		33		19.70
$4.36 - $29.55		514,360		3.87	$	5.11		514,360	$	5.11

Summary of Stock Unit Activity

The following is a summary of RSU activity for the three months ended March 31, 2022:

	Number Outstanding			Weighted Average Fair Value
Unvested as of December 31, 2021		485,729		$	9.19
Granted		144,738			20.89
Vested		(71,310	)		7.84
Forfeited		(1,844	)		11.71
Unvested as of March 31, 2022		557,313		$	12.40
RSUs vested but not released		301,439		$	5.48

Stock-Based Compensation Expense Related to Stock Options, RSUs and PSUs

The following table summarizes stock-based compensation expense related to stock options, RSUs, and PSUs included in the condensed consolidated statements of comprehensive loss for the three months ended March 31, 2022 and 2021 (in thousands):

	Three Months Ended March 31,
	2022		2021
Cost of revenue	$	56	$	33
Research and development		310		162
Selling and marketing		194		103
General and administrative		335		460
Total	$	895	$	758

Performance Stock Units

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Stock Unit Activity

The following is a summary of PSU activity for the three months ended March 31, 2022:

	Number Outstanding
Unvested as of December 31, 2021		175,000
Granted		—
Vested		(20,000	)
Forfeited		(80,000	)
Unvested as of March 31, 2022		75,000