CONTINGENCIES (Details) - USD ($) $ in Thousands		3 Months Ended		60 Months Ended
	Apr. 30, 2017	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2025
Product warranty accrual [Roll Forward]
Accrual balance at beginning of year		$ 1,337	$ 1,706	$ 1,364
Accruals for product warranties		384	227
Cost of warranty claims		(357)	(338)
Accrual balance at end of period		1,364	$ 1,595
Standby Letters of Credit [Member] | Office Space - Burlington, Massachusetts [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued		1,300
Loss Contingency, Range Of Possible Loss, Portion Not Accrued, Minimum		1,200
Standby Letters of Credit [Member] | Office Space - Other Facilities [Member]
Operating Lease Commitments [Abstract]
Letters of Credit Outstanding, Amount		600
Standby Letters of Credit [Member] | Other Operating Obligations [Member]
Operating Lease Commitments [Abstract]
Letters of Credit Outstanding, Amount		2,100
Research and Development Arrangement [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	$ 12,800			$ 32,200
Long-term Purchase Commitment, Period	3 years			5 years
Research and Development Expense [Member]
Loss Contingencies [Line Items]
Other Inventory, Purchased Goods, Gross		$ 12,800