Condensed Statement of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities
Net income	$ 5,513	$ 676
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	704	1,117
Gain on sale of property and equipment	(167)
Stock-based compensation	3,287	2,474
Non-cash warrant revaluation	(21)	5
Non-cash interest expense	93	274
Changes in operating assets and liabilities:
Accounts receivable	(4,357)	(3,022)
Inventory	(1,466)	(947)
Prepaid expenses and other current assets	470	(67)
Other assets	(28)	(175)
Accounts payable	1,218	656
Accrued liabilities	(1,138)	655
Deferred revenue	(25)	1,382
Lease liabilities	175	(90)
Net cash (used in) provided by operating activities	4,258	2,938
Cash flows from investing activities
Purchases of property and equipment	(1,320)	(578)
Proceeds received from sale of property and equipment	202
Net cash used in investing activities	(1,118)	(578)
Cash flows from financing activities
Payments on long-term debt	(1,800)	(2,800)
Proceeds from exercise of stock options and purchase of shares in employee stock purchase plan	703	399
Payments of debt issuance costs	(10)
Net cash used in financing activities	(1,107)	(2,401)
Net increase (decrease) in cash and cash equivalents	2,033	(41)
Cash and cash equivalents at beginning of period	21,409	14,599
Cash and cash equivalents at end of period	23,442	14,558
Supplementary cash flow information:
Interest paid	125	178
Operating cash flows paid for operating leases	978	1,212
Financing cash flows paid for finance leases	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
Bonus settled in shares of common stock		$ 364