CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (10,639,000)	$ (20,087,000)	$ (15,977,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for credit losses and recoveries	2,000	(16,000)	(21,000)
Provision for excess and obsolete inventories	305,000	180,000	226,000
Non-cash lease expense	1,098,000	576,000	581,000
Change in fair value of contingent consideration	(160,000)	(892,000)	(1,685,000)
Depreciation and amortization	665,000	927,000	1,015,000
Gain on sale of assets	(5,793,000)
Stock-based compensation	2,262,000	2,838,000	2,469,000
Amortization of premium on investments		(2,000)	13,000
Changes in assets and liabilities:
Accounts receivable	(53,000)	369,000	1,068,000
Inventories	781,000	1,258,000	(1,986,000)
Prepaid expenses and other assets	(1,091,000)	(536,000)	140,000
Accounts payable	306,000	(355,000)	(383,000)
Accrued expenses and other liabilities	(658,000)	(1,610,000)	(2,305,000)
Net cash used in operating activities	(12,975,000)	(17,350,000)	(16,845,000)
Cash flows from investing activities:
Proceeds from sale of assets	11,392,000
Maturities of short-term investments		3,405,000	7,000,000
Purchases of property and equipment	(45,000)	(645,000)	(316,000)
Net cash provided by investing activities	11,347,000	2,760,000	6,684,000
Cash flows from financing activities:
Proceeds from issuance of common stock under At-the-Market offering, net of offering costs of $389		153,000
Proceeds from issuance of common stock under employee stock plans	633,000	1,654,000	402,000
Net cash provided by financing activities	633,000	1,807,000	402,000
Net increase (decrease) in cash and cash equivalents	(995,000)	(12,783,000)	(9,759,000)
Cash and cash equivalents at beginning of the period	14,429,000	27,212,000	36,971,000
Cash and cash equivalents at end of the period	13,434,000	14,429,000	27,212,000
Non-cash investing and financing activities:
Purchases of property and equipment through accounts payable and accruals		598,000	564,000
Operating lease right-of-use assets exchanged for lease obligations	9,092,000	1,445,000	376,000
Supplemental cash flow information:
Net cash paid for income taxes	$ 256,000	$ 389,000	$ 155,000