INCOME TAXES - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Deferred tax assets
Loss carryforwards	$ 54,280	$ 56,675	$ 59,636
Deferred revenue	27,431	25,903	29,206
Capitalized research and development	27,785	23,949	16,289
Tax credits	15,888	15,894	16,085
Disallowed interest	16,572	13,162	12,296
Other accruals and reserves not currently deductible for tax purposes	4,685	4,494	4,450
Lease obligations	2,269	2,384	2,514
Inventory	2,426	2,715	1,701
Acquired intangibles	1,344	961	853
Accrued warranty expense	365	495	447
Gross deferred tax assets	153,045	146,632	143,477
Valuation allowance	(147,674)	(141,218)	(138,086)
Total deferred tax assets, net of valuation allowance	5,371	5,414	5,391
Deferred tax liabilities
Depreciation	(2,038)	(2,009)	(1,921)
Lease assets	(1,929)	(2,128)	(2,439)
Other	(1,130)	(548)	(1,048)
Total deferred tax liabilities	(5,097)	(4,685)	(5,408)
Net deferred tax assets (liabilities)	$ 274	$ 729
Net deferred tax assets (liabilities)			$ (17)