Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2017

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

Summary of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense by financial statement line item for the three and nine months ended December 31, 2017 and 2016 (in thousands):



	Three months ended December 31,				Nine months ended December 31,
	2017		2016		2017		2016
Cost of revenues	$	39	$	40	$	98	$	139
Research and development	184		61		294		153
Selling, general and administrative	660		512		1,723		1,974
Total	$	883	$	613	$	2,115	$	2,266

Schedule of Weighted Average Assumptions for Stock Options

These options will vest over 2 years. The weighted average assumptions used in the Black Scholes valuation model for stock options granted during the nine months ended December 31, 2016 are as follows:



	December 31, 2017	December 31, 2016
Expected volatility	N/A	67.6	%
Risk-free interest rate	N/A	1.3	%
Expected life (years)	N/A	5.7
Dividend yield	N/A	None