Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2014

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

Schedule of Assumptions Used

The Company did not grant options or employee stock purchase rights during the three months ended December 31, 2014 and 2013. The fair values of the options and employee stock purchase rights granted during the nine months ended December 31, 2014 and 2013 are estimated as of the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions:

	Options				Employee Stock Purchase Rights
	Nine months ended December 31,				Nine months ended December 31,
	2014	2013			2014			2013
Expected life (years)	*	4.4			0.5			0.5
Risk-free interest rate	*	0.6		%	0.1		%	0.1		%
Volatility	*	49		%	57		%	57		%
Dividend yield	*	—		%	—		%	—		%
Weighted average fair value	*	$	2.95		$	2.57		$	3.67

* The Company did not grant options during the nine months ended December 31, 2014.

Summary of Stock-Based Compensation Expense of Stock Options and Restricted Stock Units

The following table summarizes stock-based compensation expense related to stock options and RSUs (in thousands):

	Three Months Ended					Nine Months Ended
	December 31,					December 31,
	2014			2013		2014			2013
Stock-based compensation expense by type of grant:
Stock options	$	454		$	648	$	1,160		$	1,987
RSUs	4,428			5,231		13,148			11,454
	4,882			5,879		14,308			13,441
Stock-based compensation expensed from (capitalized to) inventory	(25		)	3		(5		)	(11		)
Total stock-based compensation expense	$	4,857		$	5,882	$	14,303		$	13,430

Summary of Stock-Based Compensation Expense

The following table summarizes stock-based compensation expense as it relates to the Company’s Condensed Consolidated Statement of Operations (in thousands):

	Three Months Ended					Nine Months Ended
	December 31,					December 31,
	2014			2013		2014			2013
Stock-based compensation expense by cost centers:
Cost of revenues	$	97		$	118	$	226		$	353
Research and development	2,992			1,545		9,039			4,867
Selling, general and administrative	1,793			4,216		5,043			8,221
	$	4,882		$	5,879	$	14,308		$	13,441
Stock-based compensation expensed from (capitalized to) inventory	(25		)	3		(5		)	(11		)
Total stock-based compensation expense	$	4,857		$	5,882	$	14,303		$	13,430