Stock-Based Compensation Expense (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Summary of Stock-based Compensation Expense

Stock-based compensation expense was allocated as follows:

	Years Ended December 31,
	2023		2022
	(in thousands)
Cost of revenues	$	307	$	481
Sales and marketing		502		596
Research and development		825		996
General and administrative		1,372		1,482
	$	3,006	$	3,555

Summary of Stock Option Activity

A summary of stock option activity under the 2006 Plan and the 2013 Plan is as follows:

	Options Outstanding
	Number of Shares			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contract Term (in Years)		Aggregate Intrinsic Value
Balance at December 31, 2021		383		$	23.23		4.85	$	—
Options forfeited and cancelled		(46	)		49.87		—
Balance at December 31, 2022		337		$	19.59		4.45	$	—
Options forfeited and cancelled		(16	)		76.91		—
Balance at December 31, 2023		321		$	16.78		3.63	$	—
Options exercisable as of December 31, 2023		321		$	16.78		3.63
Options vested as of December 31, 2023		321			16.78		3.63
Options vested and expected to vest as of December 31, 2023		321			16.78		3.63

Summary of RSU Activity

A summary of RSU activity under the 2013 Plan and Amended and Restated Plan is as follows:

	RSUs Outstanding
	Number of Shares			Weighted Average Grant Date Fair Value Per Unit
Granted and unvested at December 31, 2021		1,542		$	4.60
RSUs granted		1,142			1.90
RSUs vested		(594	)		3.72
RSUs cancelled and withheld to cover taxes		(276	)		5.91
Granted and unvested at December 31, 2022		1,814		$	2.99
RSUs granted		1,482			1.23
RSUs vested		(825	)		2.97
RSUs cancelled and withheld to cover taxes		(746	)		2.99
Granted and unvested at December 31, 2023		1,725		$	1.48