SHARE-BASED COMPENSATION (Tables)

3 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Summary of Share-Based Compensation Expense

The following is a summary of share-based compensation expense including restricted stock units and performance-based restricted stock units granted pursuant to the Company's Amended 2007 Plan, the 2019 Plan, and the 2019 Amended Plan and employee stock purchases made under the Company's 2011 Employee Stock Purchase Plan, as amended, (ESPP), based on estimated fair values within the applicable cost and expense lines identified below (in thousands):

	Three Months Ended
	June 30,
	2021		2020
Cost of product revenue	$	274	$	245
Cost of service revenue	1,613		1,350
Research and development	4,091		3,781
Sales and marketing	4,814		3,992
General and administrative	3,173		2,728
	$	13,965	$	12,096