SHARE-BASED COMPENSATION (Tables)

3 Months Ended

Jun. 30, 2018

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 granted pursuant to the Company's 2007 Equity Incentive Plan, as amended, and employee stock purchases made under the Company's 2011 Employee Stock Purchase Plan (ESPP) based on estimated fair values within the applicable cost and expense lines identified below (in thousands):

	Three Months Ended
	June 30,
	2018		2017
Cost of product revenue	$	269	$	213
Cost of service revenue	1,330		1,016
Research and development	4,151		3,175
Sales and marketing	4,359		3,444
General and administrative	2,856		2,383
	$	12,965	$	10,231