Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (5,374)	$ (4,532)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	26	26
Amortization of operating lease right-of-use assets	191	153
Share-based compensation expense	73	147
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(438)	(368)
Accounts payable	519	129
Operating lease liability	(177)	(157)
Accrued expenses and other liabilities	(741)	(336)
Net cash used in operating activities	(5,921)	(4,938)
Cash flows from investing activities:
Purchases of property and equipment	(82)
Net cash used in investing activities	(82)
Cash flows from financing activities:
Proceeds from exercise of warrants		8,509
Net cash provided by financing activities		8,509
(Decrease) / Increase in cash and cash equivalents and restricted cash	(6,003)	3,571
Cash, cash equivalents and restricted cash at beginning of period	19,181	19,603
Cash, cash equivalents and restricted cash at end of period	$ 13,178	23,174
Supplemental disclosure of cash flow information and non-cash investing and financing activities:
Increase in operating right-of-use assets and liabilities related to lease modifications		$ 143