Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2012

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 nine months ended December 31, 2012 and 2011 is estimated as of the grant date using the Black-Scholes option-pricing model assuming the weighted-average assumptions listed in the following table:

	Nine Months Ended December 31,
	Employee Stock Options						Employee Stock Purchase Plans
	2012			2011			2012			2011
Expected life (years)	4.5			3.8			0.5			0.5
Risk-free interest rate	0.7		%	1.4		%	0.2		%	0.2		%
Volatility	54		%	48		%	50		%	55		%
Dividend yield	—			—			—			—
Weighted average fair value	$	2.47		$	3.83		$	1.50		$	1.92

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					Nine Months Ended
	December 31,					December 31,
	2012		2011			2012		2011
Stock-based compensation expense by type of award
Stock options and warrants	$	935	$	1,646		$	3,024	$	4,207
Restricted stock units	5,276		2,824			18,427		7,533
Total stock-based compensation	6,211		4,470			21,451		11,740
Stock-based compensation expensed from/(capitalized to) inventory	11		(37		)	94		(5		)
Total stock-based compensation expense	$	6,222	$	4,433		$	21,545	$	11,735

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,
	2012		2011			2012		2011
Stock-based compensation expense by cost centers
Cost of revenues	$	147	$	120		$	502	$	297
Research and development	2,814		2,647			10,733		6,761
Selling, general and administrative	3,250		1,703			10,216		4,682
Total stock-based compensation	$	6,211	$	4,470		$	21,451	$	11,740
Stock-based compensation expensed from/(capitalized to) inventory	11		(37		)	94		(5		)
Total stock-based compensation expense	$	6,222	$	4,433		$	21,545	$	11,735