Stock-Based Compensation (Tables)

3 Months Ended

Jun. 30, 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 fair value of the options granted during the three months ended June 30, 2013 and 2012 is estimated as of the grant date using the Black-Scholes option-pricing model assuming the weighted-average assumptions listed in the following table:

	Three Months Ended June 30,
	Employee Stock Options						Employee Stock Purchase Plans
	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		%	0.1		%
Volatility	49		%	54		%	50		%	56		%
Dividend yield	—			—			—			—
Weighted average fair value	$	2.95		$	2.47		$	2.47		$	2.40

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 restricted stock units (in thousands):

	Three Months Ended
	June 30,
	2013			2012
Stock-based compensation expense by type of award
Stock options	$	602		$	1,488
Restricted stock units	3,124			6,120
Total stock-based compensation	3,726			7,608
Stock-based compensation (capitalized to)/expensed from inventory	(12		)	81
Total stock-based compensation expense	$	3,714		$	7,689

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
	June 30,
	2013			2012
Stock-based compensation expense by cost centers
Cost of revenues	$	108		$	180
Research and development	1,798			4,205
Selling, general and administrative	1,820			3,223
Total stock-based compensation	$	3,726		$	7,608
Stock-based compensation (capitalized to)/expensed from inventory	(12		)	81
Total stock-based compensation expense	$	3,714		$	7,689