Employee Benefit Plans and Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Employee Benefit Plans and Stock-based Compensation

Summary of compensation costs related to stock-based awards

	Year Ended
	December 31,
	2023		2022		2021
Cost of revenue	$	414	$	379	$	368
Selling, general and administrative		2,502		2,947		3,514
Research and development		624		680		637
Net effect on net income (loss)	$	3,540	$	4,006	$	4,519
Shares used in computing basic net income (loss) per share		42,643		42,104		41,367
Shares used in computing diluted net income (loss) per share		42,643		42,715		42,720
Effect on basic net income (loss) per share	$	0.08	$	0.10	$	0.11
Effect on diluted net income (loss) per share	$	0.08	$	0.09	$	0.11

Summary of stock option activity

The following table summarizes the stock option transactions for each of the years ended December 31, 2021, 2022 and 2023 (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, 2021	1,885	$	4.42	6.17	$	9,713
Granted	—		—
Exercised	(507)		3.30
Canceled and expired	—		—
Balance as of December 31, 2021	1,378	$	4.83	5.60	$	5,573
Granted	—		—
Exercised	(172)		3.02
Canceled and expired	—		—
Balance as of December 31, 2022	1,206	$	5.09	5.08	$	630
Granted	—		—
Exercised	(4)		2.30
Canceled and expired	(4)		4.12
Balance as of December 31, 2023	1,198	$	5.10	4.09	$	14
Options vested as of December 31, 2023 and unvested options expected to vest, net of forfeitures	1,198	$	5.10	4.09	$	14
Options exercisable as of December 31, 2023	1,198	$	5.10	4.09	$	14

Summary of options outstanding and exercisable by exercise price ranges

The options outstanding and exercisable as of December 31, 2023 were in the following exercise price ranges (in thousands, except per share data):

									Options Vested and
					Options Outstanding as of				Exercisable as of
					December 31, 2023				December 31, 2023
								Weighted‑average
Range of						Weighted‑average		Remaining		Weighted‑Average
Exercise Price					Shares	Exercise Price		Contractual Life	Shares	Exercise Price
$	2.14	-	$	2.14	8	$	2.14	0.33	8	$	2.14
$	2.18	-	$	2.18	54	$	2.18	1.84	54	$	2.18
$	2.47	-	$	2.47	15	$	2.47	0.84	15	$	2.47
$	2.56	-	$	2.56	10	$	2.56	2.01	10	$	2.56
$	3.06	-	$	3.06	330	$	3.06	5.85	330	$	3.06
$	5.21	-	$	5.21	352	$	5.21	2.82	352	$	5.21
$	5.77	-	$	5.77	245	$	5.77	4.85	245	$	5.77
$	7.95	-	$	7.95	60	$	7.95	3.08	60	$	7.95
$	9.50	-	$	9.50	124	$	9.50	3.82	124	$	9.50
					1,198	$	5.10	4.09	1,198	$	5.10

Summary of restricted stock awards activity

A summary of activity related to restricted stock awards for the years ended December 31, 2021, 2022 and 2023 is presented below (in thousands, except per share data):

		Weighted-Average
		Grant Date
Stock Awards	Shares	Share Value
Non-vested as of January 1, 2021	1,022	$	5.27
Granted	274	$	9.07
Vested	(407)	$	5.70
Forfeited	(14)	$	5.38
Non-vested as of December 31, 2021	875	$	6.26
Granted	513	$	4.67
Vested	(387)	$	6.01
Forfeited	(17)	$	5.34
Non-vested as of December 31, 2022	984	$	5.55
Granted	692	$	2.20
Vested	(446)	$	5.25
Forfeited	(10)	$	6.37
Non-vested as of December 31, 2023	1,220	$	3.75

Summary of unvested at-risk performance shares

A summary of the status of our unvested at-risk, performance shares as of December 31, 2023 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	152	*	$	15.37
Granted	74		$	7.83
Vested	(76)		$	15.37
Forfeited	(74)		$	7.83
Non-vested as of December 31, 2022	76		$	15.37
Granted	13		$	3.71
Vested	(38)		$	15.37
Forfeited	(13)		$	3.71
Non-vested as of December 31, 2023	38		$	15.37

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

Summary of common stock reserved for future issuance

The following number of shares of common stock were reserved and available for future issuance as of December 31, 2023 (in thousands, except per share data):

Options outstanding	1,198
Restricted stock awards outstanding	1,257
Stock available for future grant: 2015 Equity Incentive Plan	1,743
Total	4,198