Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net loss	$ (18,292)	$ (10,716)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation	429	106
Non-cash lease expense	103	324
Stock-based compensation	10,576	9,363
Gain on debt extinguishment		(2,183)
Non-cash interest		25
Accretion of short-term investment discount	(128)
Changes in operating assets and liabilities:
Accounts receivable	316	(1,891)
Inventories	(2,906)	(1,138)
Prepaid expenses and other current assets	1,031	(640)
Compensating cash arrangement		251
Other assets	70	30
Accounts payable	(169)	1,434
Accrued liabilities	(267)	(681)
Deferred revenue	989	2,683
Other liabilities	(167)	87
Net cash used in operating activities	(8,415)	(2,946)
Cash flows from investing activities
Purchase of property and equipment	(2,378)	(1,397)
Purchases of short-term investments	(19,716)
Net cash used in investing activities	(22,094)	(1,397)
Cash flows from financing activities
Proceeds from issuance of stock, net of issuance costs	220	547
Net cash provided by financing activities	220	547
Net decrease in cash, cash equivalents, and restricted cash	(30,289)	(3,796)
Cash, cash equivalents, and restricted cash at beginning of period	40,144	43,940
Cash, cash equivalents, and restricted cash at end of period	9,855	40,144
Supplemental disclosure of cash flow information:
Interest paid
Purchase of property and equipment included in accounts payable	313	1,146
Reconciliation of cash, cash equivalents, and restricted cash to balance sheet as of December 31st:
Cash and cash equivalents	8,586	38,739
Restricted cash - current	525	453
Restricted cash	744	952
Total cash, cash equivalents, and restricted cash	$ 9,855	$ 40,144