Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2021

Summary Components of Stock-Based Compensation Expense

The following table summarizes the components of stock-based compensation expense on the condensed consolidated statements of operations for the three months ended March 31, 2021 and 2020:

	Three Months Ended
	March 31,
	2021		2020
Cost of services	$	122	$	171
Cost of product sales		42		33
Selling, general and administrative		1,307		1,167
Product development		290		308
Total	$	1,761	$	1,679

Time-Based Stock Appreciation Rights [Member]

Summary of Stock Appreciation Rights

A summary of the Company’s time-based stock appreciation rights (“SARs”) for the three months ended March 31, 2021 is as follows:

						Weighted-
						Average		Aggregate
				Weighted-		Remaining		Intrinsic
	Number of			Average		Contractual		Value
	Shares			Exercise Price		Term (years)		(In thousands)
Outstanding at January 1, 2021		1,802,844		$	5.79
Granted		—			—
Exercised		(37,600	)		3.80
Forfeited or expired		(32,500	)		3.05
Outstanding at March 31, 2021		1,732,744		$	4.85		2.38	$	4,196
Exercisable at March 31, 2021		1,732,744		$	4.85		2.38	$	4,495
Vested and expected to vest at March 31, 2021		1,732,744		$	4.85		2.38	$	4,196

Performance-Based Stock Appreciation Rights [Member]

Summary of Stock Appreciation Rights

A summary of the Company’s performance-based SARs for the three months ended March 31, 2021 is as follows:

						Weighted-
						Average		Aggregate
				Weighted-		Remaining		Intrinsic
	Number of			Average		Contractual		Value
	Shares			Exercise Price		Term (years)		(In thousands)
Outstanding at January 1, 2021		78,921		$	3.16
Granted		—			—
Exercised		(17,450	)		3.36
Forfeited or expired		—			—
Outstanding at March 31, 2021		61,471		$	3.61		1.73	$	827
Exercisable at March 31, 2021		61,471		$	3.61		1.73	$	827
Vested and expected to vest at March 31, 2021		61,471		$	3.61		1.73	$	827

Time-Based Restricted Stock Units [Member]

Summary of Restricted Stock Units

A summary of the Company’s time-based restricted stock units (“RSUs”) for the three months ended March 31, 2021 is as follows:

	Shares			Weighted- Average Grant Date Fair Value
Balance at January 1, 2021		1,297,273		$	4.90
Granted		97,302			7.06
Vested		(799,573	)		4.01
Forfeited or expired		(30,667	)		7.31
Balance at March 31, 2021		564,335		$	6.36

Performance-Based Restricted Stock Units [Member]

Summary of Restricted Stock Units

A summary of the Company’s performance-based RSUs for the three months ended March 31, 2021 is as follows:

	Shares			Weighted- Average Grant Date Fair Value
Balance at January 1, 2021		1,150,912		$	4.70
Granted		2,025			7.27
Vested		(326,863	)		3.92
Forfeited or expired		(370,340	)		3.95
Balance at March 31, 2021		455,734		$	6.17

Market Performance Units [Member]

Fair Value of Stock Appreciation Rights Estimated

As the MPUs contain both performance and service conditions, they have been treated as a series of three separate awards, or tranches, for purposes of recognizing stock-based compensation expense. The Company recognizes stock-based compensation expense on a tranche-by-tranche basis over the requisite service period for each specific tranche. The Company estimated the fair values of the MPUs using a Monte Carlo simulation model that used the following assumptions:

	Three Months Ended March 31,
	2021	2020
Risk-free interest rate	0.06% to 0.30%	0.16% to 0.28%
Estimated volatility factor	60.0% to 81.0%	56.0% to 91.0%
Expected dividends	None	None