Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2023		2022
Sales and marketing	162		83
Research and development	224		261
General and administrative	559		721
Total non-cash stock compensation expense	$	945	$	1,065

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 three months ended March 31, 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		$	6
Forfeited	(18)	$	4.31		$	7
Outstanding as of March 31, 2023	121	$	3.66	4.75	$	—
Vested and expected to vest at March 31, 2023	120	$	3.65	4.73	$	—
Exercisable as of March 31, 2023	112	$	3.58	4.52	$	—

Summary of restricted stock awards outstanding

A summary of the Company’s restricted stock awards outstanding under the 2015 OEIP for the three months ended March 31, 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	(316)	4.30
Canceled and forfeited	(94)	3.75
Unvested at March 31, 2023	2,627	3.23