Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

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 years ended December 31, 2015, 2014 and 2013:

	Years ended December 31,
	2015		2014		2013
Cost of services	$	525	$	203	$	303
Cost of product sales		45		53		114
Selling, general and administrative		3,655		3,135		2,316
Product development		395		219		240
Total	$	4,620	$	3,610	$	2,973

Time-Based Stock Appreciation Rights [Member]

Summary of Stock Appreciation Rights

A summary of the Company’s time-based SARs for the year ended December 31, 2015 is as follows:

	Number of Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (years)		Aggregate Intrinsic Value
Outstanding at January 1, 2015		3,853,367		$	4.53
Granted		483,000			6.07
Exercised		(150,050	)		4.03
Forfeited or expired		(77,133	)		5.39
Outstanding at December 31, 2015		4,109,184		$	5.22		5.66	$	10,610
Exercisable at December 31, 2015		3,456,039		$	5.16		4.97	$	10,197
Vested and expected to vest at December 31, 2015		4,109,184		$	5.22		5.66	$	10,610

Performance-Based Stock Appreciation Rights [Member]

Summary of Stock Appreciation Rights

A summary of the Company’s performance-based SARs for the year ended December 31, 2015 is as follows:

	Number of Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term  (years)		Aggregate Intrinsic Value
Outstanding at January 1, 2015		786,034		$	5.51
Granted		8,000			5.65
Exercised		(15,100	)		2.92
Forfeited or expired		(160	)		5.65
Outstanding at December 31, 2015		778,774		$	6.33		4.38	$	2,177
Exercisable at December 31, 2015		774,774		$	6.33		4.35	$	2,170
Vested and expected to vest at December 31, 2015		778,774		$	6.33		4.38	$	2,177

Fair Value of Stock Appreciation Rights Estimated

The fair value of each time-based and performance-based SAR award is estimated on the date of grant using the Black-Scholes option pricing model with the assumptions described below. For the periods indicated the expected volatility was based on the Company’s historical volatility over the expected terms of SAR awards. Estimated forfeitures were based on voluntary and involuntary termination behavior, as well as analysis of actual forfeitures. The risk-free interest rate was based on the U.S. Treasury yield curve at the time of the grant over the expected term of the SAR grants.

	Years ended December 31,
	2015		2014		2013
Risk-free interest rate	1.35% to 1.82%		1.77% to 1.94%		0.91% to 2.11%
Expected life (years)		6.0		6.0	5.5 and 6.0
Estimated volatility factor	62.7% to 64.6%		64.8% to 67.3%		67.6% to 69.9%
Expected dividends	None		None		None

Time-Based Restricted Stock Units [Member]

Summary of Restricted Stock Units

A summary of the Company’s time-based RSUs for the year ended December 31, 2015 is as follows:

	Shares			Weighted-Average Grant Date Fair Value
Balance at January 1, 2015		90,255		$	6.66
Granted		366,004			6.63
Vested		(90,255	)		7.04
Forfeited or expired		—			—
Balance at December 31, 2015		366,004		$	6.63

Performance-Based Restricted Stock Units [Member]

Summary of Restricted Stock Units

A summary of the Company’s performance-based RSUs for the year ended December 31, 2015 is as follows:

	Shares			Weighted-Average Grant Date Fair Value
Balance at January 1, 2015		321,525		$	6.41
Granted		340,094			6.64
Vested		(137,127	)		6.09
Forfeited or expired		(25,123	)		6.23
Balance at December 31, 2015		499,369		$	6.66

Performance Units [Member]

Fair Value of Stock Appreciation Rights Estimated

As the MPUs contain both a performance and service condition, the MPUs 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:

	Years Ended December 31,
	2015	2014	2013
Risk-free interest rate	0.65% to 1.31%	0.25% to 1.10%	0.13% to 0.78%
Estimated volatility factor	34.0%to38.0%	39.0%to41.0%	40.0%
Expected dividends	None	None	None