Condensed Statement of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net income	$ 7,084	$ 5,513
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	905	704
Gain on sale of property and equipment	(15)	(167)
Stock-based compensation	3,700	3,287
Loss on prepayment and termination of credit facility	170
Non-cash warrant revaluation	(25)	(21)
Non-cash interest expense	26	93
Changes in operating assets and liabilities:
Accounts receivable	577	(4,357)
Inventory	(1,954)	(1,466)
Prepaid expenses and other current assets	366	470
Other assets		(28)
Accounts payable	599	1,218
Accrued liabilities	(54)	(1,138)
Deferred revenue	(311)	(25)
Lease liabilities	18	175
Net cash provided by operating activities	11,086	4,258
Cash flows from investing activities
Purchases of property and equipment	(1,080)	(1,320)
Proceeds received from sale of property and equipment	15	202
Net cash used in investing activities	(1,065)	(1,118)
Cash flows from financing activities
Payments on long-term debt	(2,790)	(1,800)
Proceeds from exercise of stock options and purchase of shares in employee stock purchase plan	908	703
Payments of debt issuance costs		(10)
Net cash used in financing activities	(1,882)	(1,107)
Net increase in cash and cash equivalents	8,139	2,033
Cash and cash equivalents at beginning of period	26,795	21,409
Cash and cash equivalents at end of period	34,934	23,442
Supplementary cash flow information:
Interest paid	37	125
Operating cash flows paid for operating leases	1,038	978
Financing cash flows paid for finance leases	9	8
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		$ 773
Cashless exercise of warrants	$ 2