STOCK PLANS (Tables)

12 Months Ended

Mar. 31, 2016

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

Summary of 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,
	2016		2015		2014
Cost of product revenue	$	645	$	338	$	228
Cost of service revenue	2,601		1,194		741
Research and development	9,205		5,505		4,361
Sales and marketing	8,725		4,841		3,791
General and administrative	7,175		4,702		3,809
	$	28,351	$	16,580	$	12,930

Summary of 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, 2016, 2015 and 2014 are summarized in the table below.

	Stock Options				Restricted Stock Units
	Number of Shares		Weighted Average Exercise Price		Number of Awards		Weighted Average Fair Value
Outstanding – March 31, 2013	154,000		$	6.63	1,870,826		$	18.09
Granted	—		—		602,359		25.75
Exercised (Options)/Issued (RSU’s)	(117,650	)	6.91		(635,254	)	17.14
Canceled	(5,000	)	3.76		(99,632	)	17.61
Outstanding – March 31, 2014	31,350		$	5.87	1,738,299		$	21.11
Granted	—		—		1,009,770		36.92
Exercised (Options)/Issued (RSU’s)	(23,850	)	5.87		(728,239	)	18.97
Canceled	(7,500	)	5.87		(90,515	)	21.44
Outstanding – March 31, 2015	—		$	—	1,929,315		$	30.18
Granted	—		—		1,806,490		37.20
Exercised (Options)/Issued (RSU’s)	—		—		(736,170	)	26.52
Canceled	—		—		(126,329	)	34.99
Outstanding – March 31, 2016	—		$	—	2,873,306		$	35.32

Schedule of Aggregate Intrinsic Values of Stock Options and Restricted Stock Units

The aggregate intrinsic value of stock options exercised and the fair value of restricted stock units vested at March 31, 2016, 2015 and 2014 were as follows (in thousands):

	Year Ended March 31,
	2016		2015		2014
Total intrinsic value of stock options exercised	$	—	$	800	$	2,375
Total fair value of restricted stock unit awards vested	$	25,936	$	31,651	$	16,104