UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities
Net loss	$ (2,089)	$ (3,394)	$ (5,562)	$ (4,078)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization			76	65
Stock-based compensation			451	280
Gain from sale of subsidiary			(1)
Changes in operating assets and liabilities:
Accounts receivable			99	77
Prepaid expenses and other current assets			133	26
Other assets			107	113
Accounts payable			12	(868)
Accrued liabilities			(304)	(418)
Right-of-use asset and lease liabilities, net			53	19
Deferred revenue			(10)	(10)
Net cash used in operating activities			(4,946)	(4,794)
Cash flows from investing activities
Cash proceeds from sale of subsidiary			1
Cash paid for property and equipment				(206)
Net cash provided by (used in) investing activities			1	(206)
Cash flows from financing activities
Costs paid in connection with December 2021 financing				(9)
Repayment of finance lease obligations			(5)	(5)
Issuance costs for redeemable convertible preferred stock				(585)
Redemption payment for redeemable convertible preferred stock				(488)
Net cash used in financing activities			(5)	(1,087)
Net decrease in cash, cash equivalents and restricted cash			(4,950)	(6,087)
Cash, cash equivalents and restricted cash, beginning of period			12,509	19,085
Cash, cash equivalents and restricted cash, end of period	7,559	12,998	7,559	12,998
Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	7,259	12,598	7,259	12,598
Restricted cash	300	400	300	400
Total cash, cash equivalents and restricted cash	$ 7,559	$ 12,998	7,559	12,998
Supplemental disclosure of cash flow information
Cash paid for interest			$ 1	1
Noncash investing and financing activities
Redemption payment of redeemable convertible preferred stock from escrow				(4,762)
Issuance of redeemable convertible preferred stock, proceeds held in escrow				4,762
Fair value of warrants issued to Placement Agent				$ 34