STOCK PLANS (Tables)

12 Months Ended

Mar. 31, 2013

Share-Based Compensation Expense

The following is a summary of share-based compensation expense including restricted stock units and employee stock purchases made under our employee stock purchase plan (ESPP) based on estimated fair values within the applicable cost and expense lines identified below (in thousands):

	Year Ended March 31,
	2013		2012		2011
Cost of product revenue	$	235	$	192	$	134
Cost of service revenue		342		227		218
Research and development		2,944		2,486		1,651
Sales and marketing		3,035		3,052		2,527
General and administrative		3,024		2,745		1,909
	$	9,580	$	8,702	$	6,439

Transactions under 1999 Stock Option Plan and 2007 Equity Incentive Plan

Transactions under the 1999 Stock Option Plan and the 2007 Equity Incentive Plan during the fiscal years ended March 31, 2013, 2012 and 2011 are summarized as follows:

	Stock Options					Restricted Stock Units
	Number of Shares			Weighted Average Exercise Price		Number of Awards			Weighted Average Fair Value
Outstanding – March 31, 2010		813,741		$	7.60		1,112,376		$	9.96
Granted		0			0		928,596			13.67
Exercised (Options)/Issued (RSU’s)		(450,432	)		7.50		(504,393	)		10.81
Canceled		(37,790	)		19.42		(117,720	)		9.87
Outstanding – March 31, 2011		325,519		$	6.35		1,418,859		$	12.35
Granted		0			0		1,071,131			13.36
Exercised (Options)/Issued (RSU’s)		(84,502	)		5.58		(659,350	)		11.26
Canceled		(125	)		5.26		(75,315	)		13.60
Outstanding – March 31, 2012		240,892		$	6.63		1,755,325		$	13.33
Granted		0			0		764,893			24.19
Exercised (Options)/Issued (RSU’s)		(86,892	)		6.62		(549,932	)		12.52
Canceled		0			0		(99,460	)		16.10
Outstanding – March 31, 2013		154,000		$	6.63		1,871,148		$	17.85

Aggregate Intrinsic Values of Stock Options and Restricted Stock Units

The aggregate intrinsic values of stock options and restricted stock units as of March 31, 2013, 2012 and 2011 were as follows (in thousands):

	Year Ended March 31,
	2013		2012		2011
Total intrinsic value of stock options exercised	$	2,763	$	3,303	$	6,825
Total fair value of restricted stock unit awards vested	$	46,007	$	35,645	$	38,763