Condensed Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities
Net income	$ 4,646	$ 3,606
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	617	462
Gain on sale of property and equipment	(15)	(167)
Stock-based compensation	2,420	2,135
Loss on prepayment and termination of credit facility	170
Non-cash warrant revaluation	23	(21)
Non-cash interest expense	26	62
Changes in operating assets and liabilities:
Accounts receivable	1,639	(1,090)
Inventory	(662)	20
Prepaid expenses and other current assets	193	(38)
Other assets		664
Accounts payable	(741)	(201)
Accrued liabilities	(701)	(1,414)
Deferred revenue	(96)	(832)
Lease liabilities	12	164
Net cash provided by operating activities	7,531	3,350
Cash flows from investing activities
Purchases of property and equipment	(1,063)	(996)
Proceeds received from sale of property and equipment	15	202
Net cash used in investing activities	(1,048)	(794)
Cash flows from financing activities
Payments on long-term debt	(2,790)	(1,200)
Proceeds from exercise of stock options and purchase of shares in employee stock purchase plan	342	286
Net cash used in financing activities	(2,448)	(914)
Net increase in cash and cash equivalents	4,035	1,642
Cash and cash equivalents at beginning of period	26,795	21,409
Cash and cash equivalents at end of period	30,830	23,051
Supplementary cash flow information:
Interest paid	37	83
Operating cash flows paid for operating leases	692	635
Financing cash flows paid for finance leases	$ 6	5
Non-cash investing and financing activities:
Right-of-use assets obtained in exchange for operating lease liabilities		3,350
Right-of-use assets obtained in exchange for finance lease liabilities		36
Purchases of property and equipment in accounts payable and accrued liabilities		$ 783