Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Schedule of Stock-Based Compensation Expense Allocation

Stock-based compensation expense was $0.6 million and $0.3 million for the three months ended March 31, 2018 and 2017, 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 March 31,
	2018		2017
Cost of revenues	$	38	$	28
Sales and marketing		13		11
Research and development		18		(43	)
General and administrative		497		345
Total	$	566	$	341

Employees [Member]

Assumptions Used to Value Options Granted

The weighted-average grant date fair values of options granted to employees during the three months ended March 31, 2018 and 2017 were $3.40 and $2.44, respectively, using the following assumptions

	Three Months Ended March 31,
	2018	2017
Risk free interest rate	2.15%	1.45% - 1.48%
Expected term	4.75 years	4.5 - 4.75 years
Dividend yield	—	—
Expected volatility	47.79% - 47.86%	54.60% - 55.20%