Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock-Based Compensation Expense by Type

The stock-based compensation expense by type is as follows:

	Three Months Ended March 31,
	2022		2021
Service-based awards	$	320	$	455
Performance-based awards (short-term incentive plan)		81		58
Performance-based awards (long-term incentive plan)		306		39
Employee stock purchase plan		67		66
Total	$	774	$	618

Stock-Based Compensation

Total stock-based compensation is reflected in the condensed consolidated statements of operations as follows:

	Three Months Ended March 31,
	2022		2021
Cost of revenues	$	65	$	69
Research and development		136		142
Sales and marketing		197		160
General and administrative		376		247
Total	$	774	$	618

The following table presents a summary of the remaining unrecognized share-based compensation expense related to outstanding share-based awards as of March 31, 2022 :

Award Type	Remaining Unrecognized Compensation Expense		Weighted Average Life (Years)
Service-based awards	$	2,257		1.6
Performance-based awards	$	2,593		2.1

Summary of Service-based Restricted Stock Activity

The following table summarizes service-based restricted stock activity for the three months ended March 31, 2022: 

	Shares			Weighted Average Fair Value
Unvested Restricted Stock Awards - December 31, 2021		326,336		$	7.76
Shares awarded		230,744			4.73
Shares vested		(163,550	)		7.28
Unvested Restricted Stock Awards - March 31, 2022		393,530		$	6.18

The following table summarizes the restricted stock unit activity during the three months ended March 31, 2022:

	Shares			Weighted Average Fair Value
Unvested Restricted Stock Units - December 31, 2021		21,437		$	7.23
Units awarded		24,667			4.52
Units vested/Shares awarded		(3,201	)		7.47
Unvested Restricted Stock Units - March 31, 2022		42,903		$	5.59

Information about Stock Options Outstanding Under all Stock Plans

The following table summarizes information about stock options outstanding under all stock option plans at March 31, 2022:

	Options Outstanding								Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Contractual Life (Years)		Intrinsic Value		Weighted- Average Exercise Price		Number Exercisable		Weighted Average Contractual Life (Years)		Intrinsic Value		Weighted Average Exercise Price
$ 5.06 - $ 6.98		4,000		2.17	$	0	$	6.02		4,000		2.17	$	0	$	6.02

	Weighted Average Contractual Life (years)		Intrinsic Value
Options Outstanding		2.67	$	2
Options Exercisable		2.63	$	2

Summary of Performance Share Activity

The following table summarizes the performance award activity:

	Awards at Target			Weighted Average Fair Value
Unvested Performance Awards - December 31, 2021		333,153		$	8.39
Awards granted		269,618			4.84
Awards cancelled		(3,600	)		8.30
Unvested Performance Awards - March 31, 2022		599,171		$	6.82

Summary Of Active Performance-Based Long-Term Incentive Plans

The following table summarizes the active performance-based long-term incentive plans at March 31, 2022:

			Number of Shares
	Share Price		That Could Be Earned:
LTIP award	on Grant Date		Target		Maximum		Performance Period
2020 LTIP	$	8.70		143,289		250,756	January 1, 2020 through December 31, 2022
2021 LTIP	$	8.25		186,264		325,962	January 1, 2021 through December 31, 2023
2022 LTIP	$	4.84		269,618		471,832	January 1, 2022 through December 31, 2024
				599,171		1,048,550

Calculation of Fair Value of Each Employee Stock Purchase Grant Using Black-Scholes Option-Pricing Model

The Company calculated the fair value of each employee stock purchase grant on the date of grant using the Black-Scholes option-pricing model using the following assumptions:

	Employee Stock Purchase Plan
	2022			2021
Dividend yield		4.7	%		3.1	%
Risk-free interest rate		1.7	%		0.1	%
Expected volatility		48	%		48	%
Expected life (in years)		0.5			0.5

Summary of Number of Unvested Director Awards Activity

The number of unvested director awards was as follows at March 31, 2022:

	Shares		Weighted Average Fair Value
Outstanding - March 31, 2022		11,534	$	6.57