Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities
Net income	$ 9,052	$ 6,129
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,205	982
Gain on sale of property and equipment	(15)	(167)
Stock-based compensation	5,005	4,408
Loss on prepayment and termination of credit facility	170
Non-cash warrant revaluation	(25)	(23)
Non-cash interest expense	26	105
Changes in operating assets and liabilities:
Accounts receivable	(889)	(2,472)
Inventory	(1,708)	(287)
Prepaid expenses and other current assets	(384)	158
Other assets	(150)	(28)
Accounts payable	499	563
Accrued liabilities	803	(46)
Deferred revenue	(485)	(11)
Lease liabilities, net	24	182
Net cash provided by operating activities	13,128	9,493
Cash flows from investing activities
Purchases of property and equipment	(1,404)	(2,788)
Proceeds received from sale of property and equipment	19	202
Net cash used in investing activities	(1,385)	(2,586)
Cash flows from financing activities
Payments on long-term debt	(2,790)	(2,400)
Payments of debt issuance costs		(10)
Proceeds from exercise of stock options and purchase of shares in employee stock purchase plan	1,198	889
Net cash used in financing activities	(1,592)	(1,521)
Net increase in cash and cash equivalents	10,151	5,386
Cash and cash equivalents at beginning of period	26,795	21,409
Cash and cash equivalents at end of period	36,946	26,795
Supplementary cash flow information:
Interest paid	37	169
Operating cash flows paid for operating leases	1,384	1,320
Financing cash flows paid for finance leases	12	11
Non-cash investing and financing activities:
Right-of-use assets obtained in exchange for operating lease liabilities		6,837
Right-of-use assets obtained in exchange for finance lease liabilities		36
Purchases of property and equipment in accounts payable and accrued liabilities	446	$ 807
Cashless exercise of warrants	$ 2