UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net (loss) income	$ (2,835)	$ 2,510
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation	354	309
Amortization of intangible assets	52	67
Stock-based compensation	254	160
Amortization of debt issue costs	15	16
Deferred income tax	(978)	872
Gain on sale of property and equipment	(1)
Provision for inventory reserves	100	134
Other	(9)
Changes in operating assets and liabilities:
Accounts receivable	109	(5,934)
Revenue earned but not billed	527	1,886
Inventories	979	(1,232)
Prepaid expenses and other assets	160	251
Accounts payable	(2,491)	1,447
Accrued expenses and other	(1,273)	(3,550)
Deferred revenue, current and long-term	32	98
Net cash used in operating activities	(5,005)	(2,966)
Investing activities
Cash to fund acquisition	55
Cash paid for investment		(500)
Purchases of property and equipment	(139)	(152)
Additions to patents and licenses	(1)	(4)
Net cash used in investing activities	(85)	(656)
Financing activities
Payment of long-term debt	(4)	(4)
Payments to settle employee tax withholdings on stock-based compensation	(2)	(4)
Deferred financing costs		(4)
Net proceeds from employee equity exercises	54	104
Net cash provided by financing activities	48	92
Net decrease in cash and cash equivalents	(5,042)	(3,530)
Cash and cash equivalents at beginning of period	14,466	19,393
Cash and cash equivalents at end of period	$ 9,424	$ 15,863