Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of Stock-Based Compensation Expense Allocation

Stock-based compensation expense for the three months ended June 30, 2018 and 2017 was $0.5 million and $0.5 million, respectively. Stock-based compensation expense for the six months ended June 30, 2018 and 2017 was $1.1 million and $0.8 million, respectively. Total stock-based compensation expense was recorded to cost of revenues and operating expenses based upon the functional responsibilities of the individuals holding the respective awards as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Cost of revenues	$	39	$	31	$	77	$	59
Sales and marketing		12		12		25		23
Research and development		40		71		58		28
General and administrative		412		390		909		735
Total	$	503	$	504	$	1,069	$	845

Employees [Member]

Assumptions Used to Value Options Granted

The weighted-average grant date fair values of options granted to employees during the six months ended June 30, 2018 and 2017 were $3.40 and $2.43, respectively, using the following assumptions

	Six Months Ended June 30,
	2018	2017
Risk free interest rate	2.15%	1.45% - 1.59%
Expected term	4.75 years	4.5 - 4.75 years
Dividend yield	—	—
Expected volatility	47.79% - 47.86%	53.15% - 55.20%