UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities
Net loss	$ (6,637)	$ (2,835)
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation	346	354
Amortization of intangible assets	266	52
Stock-based compensation	188	254
Amortization of debt issue costs	24	15
Deferred income tax	0	(978)
Loss (gain) on sale of property and equipment	28	(1)
Provision for inventory reserves	161	100
Provision for credit losses	190	0
Other	1	(9)
Changes in operating assets and liabilities:
Accounts receivable	(1,075)	109
Revenue earned but not billed	89	527
Inventories	355	979
Prepaid expenses and other assets	(257)	160
Accounts payable	(1,906)	(2,491)
Accrued expenses and other	666	(1,273)
Deferred revenue, current and long-term	234	32
Net cash used in operating activities	(7,327)	(5,005)
Investing activities
Cash to fund acquisition, net of cash received	0	55
Purchases of property and equipment	(508)	(139)
Additions to patents and licenses	0	(1)
Proceeds from sale of property, plant and equipment	95	0
Net cash used in investing activities	(413)	(85)
Financing activities
Payment of long-term debt	(4)	(4)
Proceeds from revolving credit facility	0	0
Payments of revolving credit facility	0	0
Payments to settle employee tax withholdings on stock-based compensation	0	(2)
Proceeds from employee equity exercises	1	54
Net cash (used in) provided by financing activities	(3)	48
Net decrease in cash and cash equivalents	(7,743)	(5,042)
Cash and cash equivalents at beginning of period	15,992	14,466
Cash and cash equivalents at end of period	8,249	9,424
Supplemental disclosure of non-cash investing and financing activities:
Operating lease assets obtained in exchange for new operating lease liabilities	$ 363	$ 0