Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

Stock-Based Compensation

Summary of compensation costs related to stock-based awards

The following table summarizes compensation costs related to our stock-based awards (in thousands, except per share data):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2022		2021		2022		2021
Cost of revenue	$	113	$	36	$	226	$	75
Selling, general and administrative		859		802		1,674		1,442
Research and development		162		137		325		274
Total stock-based compensation		1,134		975		2,225		1,791
Tax effect on stock-based compensation		—		—		—		—
Net effect on net income	$	1,134	$	975	$	2,225	$	1,791

Summary of stock option activity

The following table summarizes the stock option transactions during the six months ended June 30, 2022 (in thousands, except per share data):

				Weighted-
				average
		Weighted-		Remaining
	Number of	average		Contractual	Aggregate
	Options	Exercise		Life	Intrinsic
Stock Options	Outstanding	Price		(in years)	Value
Balance as of January 1, 2022	1,378	$	4.83	5.60	$	5,573
Granted	—		—
Exercised	(67)		2.18
Canceled and expired	—		—
Balance as of June 30, 2022	1,311	$	4.97	5.22	$	1,751
Options vested as of June 30, 2022 and unvested options expected to vest, net of forfeitures	1,310	$	4.97	5.22	$	1,745
Options exercisable as of June 30, 2022	1,113	$	5.24	4.87	$	1,263

Summary of restricted stock awards activity

A summary of activity related to restricted stock awards for the six months ended June 30, 2022 is presented below (in thousands, except per share data):

		Weighted-Average
		Grant Date
Stock Awards	Shares	Share Value
Non-vested as of January 1, 2022	875	$	6.26
Granted	48	$	5.38
Vested	(133)	$	6.72
Forfeited	(15)	$	4.76
Non-vested as of June 30, 2022	775	$	6.22

Summary of unvested at-risk performance shares

A summary of the status of our unvested at-risk, performance shares as of June 30, 2022 is presented below (in thousands, except per share data):

			Weighted-Average
			Grant Date
Stock Awards	Shares*		Share Value
Non-vested as of January 1, 2022	114		$	15.37
Granted	74	**	$	10.91
Vested	—		$	—
Forfeited	—		$	—
Non-vested as of June 30, 2022	188		$	12.42

*The number of shares presented is based on achieving 150% of the targeted financial performance metric as defined in the at-risk, performance shares agreement.

** The first annual vesting was reported in Q4 2021, when 25% of the at-risk performance shares became eligible subject to review and confirmation by the Compensation Committee after year-end results were certified.