Stock-Based Compensation (Tables)

6 Months Ended

Sep. 30, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock-Based Compensation Expense

The Company accounts for its stock-based compensation at fair value. The following table summarizes stock-based compensation expense by financial statement line item for the three and six months ended September 30, 2014 and 2013 (in thousands):

	Three months ended September 30,				Six months ended September 30,
	2014		2013		2014		2013
Cost of revenues	$	194	$	224	$	346	$	429
Research and development		521		585		1,000		1,159
Selling, general and administrative		803		1,343		1,753		2,699
Total	$	1,518	$	2,152	$	3,099	$	4,287

Schedule of Weighted Average Assumptions used in Black-Scholes Valuation Model for Stock Options Granted

The weighted-average assumptions used in the Black-Scholes valuation model for stock options granted during the three and six months ended September 30, 2014 and 2013 are as follows:

	Three months ended September 30,				Six months ended September 30,
	2014	2013			2014			2013
Expected volatility	N/A		75.4	%		85.5	%		75.1	%
Risk-free interest rate	N/A		1.7	%		1.9	%		1.7	%
Expected life (years)	N/A		5.8			5.8			5.9
Dividend yield	N/A	None			None			None