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SHARE-BASED COMPENSATION (Tables)
 6 Months Ended
Sep. 30, 2022
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, the 2019 Amended Plan, and the 2019 Second Amended Plan, and employee stock purchases made under the Company's 2011 Amended and Restated Employee Stock Purchase Plan (ESPP), based on estimated fair values within the applicable cost and expense lines identified below (in thousands):
Three Months EndedSix Months Ended
September 30,September 30,
 2022202120222021
Cost of product revenue$315 $321 $607 $595 
Cost of service revenue2,080 1,907 3,825 3,520 
Research and development4,580 4,902 9,011 8,993 
Sales and marketing6,043 5,842 11,793 10,656 
General and administrative3,483 3,763 6,846 6,936 
$16,501 $16,735 $32,082 $30,700