Condensed Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net (loss) income	$ (202)	$ 761
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	398	333
Stock-based compensation	1,714	1,160
Loss on prepayment and termination of credit facility		170
Non-cash warrant revaluation		23
Non-cash interest expense		26
Changes in operating assets and liabilities:
Accounts receivable	(1,524)	(544)
Inventory	338	404
Prepaid expenses and other current assets	538	119
Accounts payable	(36)	125
Accrued liabilities	(2,266)	(1,457)
Deferred revenue	(255)	77
Lease liabilities, net	2	7
Net cash (used in) provided by operating activities	(1,293)	1,204
Cash flows from investing activities
Purchases of property and equipment	(1,205)	(1,011)
Net cash used in investing activities	(1,205)	(1,011)
Cash flows from financing activities
Payments on long-term debt		(2,790)
Proceeds from exercise of stock options	353	13
Net cash provided by (used in) financing activities	353	(2,777)
Net decrease in cash and cash equivalents	(2,145)	(2,584)
Cash and cash equivalents at beginning of period	36,946	26,795
Cash and cash equivalents at end of period	34,801	24,211
Supplementary cash flow information:
Interest paid		37
Operating cash flows paid for operating leases	349	375
Financing cash flows paid for finance leases	8	$ 3
Non-cash investing and financing activities:
Right-of-use assets obtained in exchange for finance lease liabilities	$ 297