Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Jun. 30, 2022
Operating activities
Net loss	$ (734)	$ (2,604)	$ (3,338)	$ (6,178)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation			(50)	418
Non-cash lease expense				8
Depreciation			1	17
Loss on sale of property and equipment				75
Change in fair value of warrant liabilities	(3,072)		(2,988)
Change in operating assets and liabilities:
Prepaid expenses and other assets			(318)	(997)
Accounts payable			260	(165)
Accrued and other liabilities			1,841	(724)
Net cash used in operating activities			(4,592)	(7,546)
Investing activities
Sale of property and equipment				8
Purchases of property and equipment			(4)
Net cash used in (provided by) investing activities			(4)	8
Financing activities
Payment of issuance costs			(80)
Net cash used in financing activities			(80)
Net decrease in cash			(4,676)	(7,538)
Cash at beginning of period		33,364	33,364	16,387
Cash at end of period	28,688		28,688	8,849
Supplemental non-cash investing and financing transactions:
Modification of right-of-use asset and associated liability				$ 62
Reclassification of warrant liabilities upon exercise of warrants	$ 5,398	$ 1,436	$ 6,833