Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Options Granted under Company's Stock Incentive Plans, Valuation Assumptions and Fair Values

Options granted under the Company’s stock incentive plans were valued utilizing the Black-Scholes model using the following assumptions and had the following fair values:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2017	2016	2017	2016
Average risk-free interest rate	1.56%	0.84%	1.52%	0.87%
Expected dividend yield	None	None	None	None
Expected life	3.5 years	3.5 years	3.5 years	3.5 years
Expected volatility	64.2% to 67.0%	68.6% to 75.3%	64.2% to 72.0%	68.6% to 75.3%
Weighted average exercise price	$4.28	$5.49	$4.39	$5.57
Weighted average fair value	$2.02	$2.67	$2.12	$2.71

Stock-Based Compensation Expense Including Options and Restricted Stock by Category

The Company’s stock-based compensation expense, including options and restricted stock by category is as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Cost of revenue	$	1	$	1		5	$	5
Engineering and product development		76		82		633		289
Marketing and sales		132		162		854		476
General and administrative		294		201		1,581		878
	$	503	$	446	$	3,073	$	1,648

Unrecognized Compensation Cost Related to Unexercisable Options and Unvested Restricted Stock and Weighted Average Remaining Period

As of September 30, 2017, unrecognized compensation cost (in thousands) related to unexercisable options and unvested restricted stock and the weighted average remaining period is as follows:

Remaining expense	$	2,504
Weighted average term		1.1 years

Aggregate Intrinsic Value

The Company’s aggregate intrinsic value for stock options and restricted stock outstanding is as follows (in thousands):

	Period Ended September 30,
Aggregate intrinsic value	2017		2016
Stock options	$	1,050	$	1,748
Restricted stock		2,242		2,039