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1. THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PP&E (Details)	12 Months Ended
	Mar. 31, 2025 USD ($) segment	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)
Property and equipment, net:
Impairment losses on long-lived equipment	$ 0	$ 0	$ 0
Inventories
Minimum months to determine excess inventory	12 months
Inventory write-downs	$ 305,000	180,000	226,000
Segments
Number of operating segments | segment	1
Accounting for stock-based compensation
Dividend yield (as a percent)	0.00%
Comprehensive income (loss)	$ (10,639,000)	(20,047,000)	$ (15,950,000)
Income taxes
Net deferred tax assets	22,800,000	20,200,000
Valuation allowance	$ 22,794,000	$ 20,165,000
Minimum
Property and equipment, net:
Useful life, intangible assets	5 years
Accounting for stock-based compensation
Expected term	4 years 10 months 24 days	4 years 6 months	4 years 7 months 6 days
Maximum
Property and equipment, net:
Useful life, intangible assets	15 years
Accounting for stock-based compensation
Expected term	5 years	4 years 10 months 24 days	5 years
Software | Minimum
Property and equipment, net:
Useful life, property and equipment	3 years
Software | Maximum
Property and equipment, net:
Useful life, property and equipment	5 years
Computer and other equipment | Minimum
Property and equipment, net:
Useful life, property and equipment	5 years
Computer and other equipment | Maximum
Property and equipment, net:
Useful life, property and equipment	10 years
Building and building improvements | Minimum
Property and equipment, net:
Useful life, property and equipment	10 years
Building and building improvements | Maximum
Property and equipment, net:
Useful life, property and equipment	25 years
Furniture and fixtures
Property and equipment, net:
Useful life, property and equipment	7 years

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