Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Summary Components of Stock-Based Compensation Expense

The following table summarizes the components of stock-based compensation expense in the condensed consolidated statements of operations for the three months ended March 31, 2019 and 2018:

	Three Months Ended
	March 31,
	2019		2018
Cost of services	$	159	$	164
Cost of product sales		43		39
Selling, general and administrative		1,626		1,292
Product development		254		212
Total	$	2,082	$	1,707

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, 2019 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, 2019		2,199,094		$	5.36
Granted		—			—
Exercised		(6,000	)		6.09
Forfeited or expired		—			—
Outstanding at March 31, 2019		2,193,094		$	5.30		3.43	$	2,483
Exercisable at March 31, 2019		2,163,094		$	5.35		3.37	$	2,709
Vested and expected to vest at March 31, 2019		2,193,094		$	5.30		3.43	$	2,483

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, 2019 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, 2019		233,496	$	6.02
Granted		—		—
Exercised		—		—
Forfeited or expired		—		—
Outstanding at March 31, 2019		233,496	$	5.96		4.38	$	974
Exercisable at March 31, 2019		233,496	$	5.96		4.38	$	974
Vested and expected to vest at March 31, 2019		233,496	$	5.96		4.38	$	974

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, 2019 is as follows:

	Shares			Weighted- Average Grant Date Fair Value
Balance at January 1, 2019		920,024		$	9.60
Granted		109,250			8.08
Vested		(358,874	)		9.78
Forfeited or expired		(5,212	)		9.87
Balance at March 31, 2019		665,188		$	9.38

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, 2019 is as follows:

	Shares			Weighted- Average Grant Date Fair Value
Balance at January 1, 2019		613,605		$	9.44
Granted		—			—
Vested		(262,685	)		9.90
Forfeited or expired		(15,332	)		9.86
Balance at March 31, 2019		335,588		$	9.46

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 that specific tranche. The Company estimated the fair value of the MPUs using a Monte Carlo simulation model that used the following assumptions:

	Three Months Ended March 31,
	2019	2018
Risk-free interest rate	2.22% to 2.43%	2.03% to 2.36%
Estimated volatility factor	33.0% to 44.0%	29.0% to 32.0%
Expected dividends	None	None