Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 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 nine months ended December 31, 2014 and 2013 (in thousands):

	Three months ended December 31,				Nine months ended December 31,
	2014		2013		2014		2013
Cost of revenues	$	186	$	330	$	533	$	758
Research and development		419		913		1,418		2,073
Selling, general and administrative		916		1,797		2,669		4,497
Total	$	1,521	$	3,040	$	4,620	$	7,328

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 nine months ended December 31, 2014 and 2013 are as follows:

	Three months ended December 31,		Nine months ended December 31,
	2014	2013	2014			2013
Expected volatility	N/A	N/A		85.5	%		75.1	%
Risk-free interest rate	N/A	N/A		1.9	%		1.7	%
Expected life (years)	N/A	N/A		5.8			5.9
Dividend yield	N/A	N/A	None			None