Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2016

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

Schedule of Stock-Based Compensation Expense Allocation

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 options as follows (in thousands):

	Three Months Ended March 31,
	2016			2015
Cost of revenues	$	26		$	19
Sales and marketing		14			8
Research and development		(146	)		375
General and administrative		224			130
Total	$	118		$	532

Assumptions Used to Weighted-Average Grant Date Fair Values of Options Granted

The weighted-average grant date fair values of options granted to employees during the three months ended March 31, 2016 and 2015 were $4.81 and $3.35, respectively, using the following assumptions:

	Three Months Ended March 31,
	2016	2015
Risk free interest rate	1.14%	0.90% - 1.06%
Expected term	4.75 years	4.56 – 4.75 years
Dividend yield	—	—
Expected volatility	79.23% - 79.29%	76.76% - 77.09%

The weighted-average grant date fair values of the options granted to non-employees during the three months ended March 31, 2016 and 2015 were $0 and $4.44, respectively, using the following assumptions:

	Three Months Ended March 31,
	2016		2015
Risk free interest rate		—		1.47	%
Expected term		—		7 years
Dividend yield		—		—
Expected volatility		—		82.88	%