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INCOME TAXES - Narrative (Details) - USD ($)
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Income Tax Contingency [Line Items]        
Provision for income taxes $ 843,000 $ 832,000 $ 569,000  
Undistributed earnings (losses) of foreign subsidiaries 15,300,000 9,000,000.0 200,000  
Deferred tax assets, valuation allowance 160,450,000 115,435,000    
Research tax credit carryforwards 5,000,000      
Unrecognized tax benefits 7,053,000 6,115,000 5,033,000 $ 3,980,000
Accrued penalties and interest 0 $ 0 $ 0  
Internal Revenue Service (IRS)        
Income Tax Contingency [Line Items]        
Research tax credit carryforwards 15,300,000      
State and Local Jurisdiction        
Income Tax Contingency [Line Items]        
Operating loss carryforwards 296,600,000      
Research tax credit carryforwards 16,900,000      
Tax Year 2019 and 2020        
Income Tax Contingency [Line Items]        
Operating loss carryforwards 433,000,000.0      
Tax Years Prior to 2019        
Income Tax Contingency [Line Items]        
Operating loss carryforwards $ 137,800,000