Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2013

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

Schedule of Weighted-Average Assumptions Used to Estimate the Fair Value of Stock Options

The Company did not grant options or employee stock purchase rights during the three months ended December 31, 2013 and 2012. The fair value of the options and employee stock purchase rights granted during the nine months ended December 31, 2013 and 2012 is estimated as of the grant date using the Black-Scholes option-pricing model with the following weighted-average assumptions:

	Nine Months Ended December 31,
	Employee Stock Options						ESPP
	2013			2012			2013			2012
Expected life (years)	4.4			4.5			0.5			0.5
Risk-free interest rate	0.6		%	0.7		%	0.1		%	0.2		%
Volatility	49		%	54		%	57		%	50		%
Dividend yield	—		%	—		%	—		%	—		%
Weighted average fair value	$	2.95		$	2.47		$	3.67		$	1.50

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,
	2013		2012		2013			2012
Stock-based compensation expense by type of award
Stock options	$	648	$	935	$	1,987		$	3,024
Restricted stock units	5,231		5,276		11,454			18,427
Total stock-based compensation	5,879		6,211		13,441			21,451
Stock-based compensation (capitalized to) expensed from inventory	3		11		(11		)	94
Total stock-based compensation expense	$	5,882	$	6,222	$	13,430		$	21,545

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,
	2013		2012		2013			2012
Stock-based compensation expense by cost centers
Cost of revenues	$	118	$	147	$	353		$	502
Research and development	1,545		2,814		4,867			10,733
Selling, general and administrative	4,216		3,250		8,221			10,216
Total stock-based compensation	$	5,879	$	6,211	$	13,441		$	21,451
Stock-based compensation (capitalized to) expensed from inventory	3		11		(11		)	94
Total stock-based compensation expense	$	5,882	$	6,222	$	13,430		$	21,545