Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Non-Cash Stock-Based Compensation Expense

Non-cash stock-based compensation expenses related to stock options, restricted stock grants and the ESPP were recorded in the financial statements as follows (unaudited, in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Cost of sales	—		1		—		1
Sales and marketing	190		652		352		735
Research and development	240		268		464		529
General and administrative	600		767		1,159		1,488
Total non-cash stock compensation expense	$	1,030	$	1,688	$	1,975	$	2,753

Summary of Outstanding Stock Options

A summary of the Company’s stock options outstanding and related information under the 2015 OEIP and 2005 Plan for the six months ended June 30, 2023 are as follows (unaudited, in thousands except weighted average exercise price and weighted average remaining contractual life):

	Shares	Weighted Avg. Exercise Price		Wtd. Avg. Remaining Contractual Life (Yrs)	Aggregate Intrinsic Value
Outstanding as of December 31, 2022	139	$	3.75	5.1	$	6
Forfeited	(51)	$	4.25		$	7
Outstanding as of June 30, 2023	84	$	3.35	4.2	$	—
Vested and expected to vest at June 30, 2023	83	$	3.34	4.2	$	—
Exercisable as of June 30, 2023	76	$	3.21	3.9	$	—

Summary of Restricted Stock Awards Outstanding

A summary of the Company’s restricted stock awards outstanding under the 2015 OEIP for the six months ended June 30, 2023 are as follows (unaudited, in thousands, except weighted average grant date fair value):

	Shares	Weighted average grant date fair value
Unvested at December 31, 2022	1,679	4.75
Granted	1,358	1.63
Vested	(543)	4.30
Canceled and forfeited	(95)	3.77
Unvested at June 30, 2023	2,399	3.13