Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (6,867)	$ (4,445)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	32	44
Stock-based compensation	527	405
Change in fair value of warrant liability	(160)	(1,577)
Operating lease, net	90	113
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	438	299
Accounts payable	860	799
Accrued expenses and other current liabilities	275	738
Net cash used in operating activities	(4,805)	(3,624)
Cash flows from investing activities:
Purchase of fixed assets	(6)	0
Net cash used in investing activities	(6)	0
Cash flows from financing activities:
Proceeds from exercise of warrants	0	63
Proceeds from sale of common stock, net of issuance costs	0	74,685
Net cash provided by financing activities	0	74,748
Effect of exchange rate changes on cash and cash equivalents	12	(4)
Net change in cash and cash equivalents	(4,799)	71,120
Cash and cash equivalents, at beginning of period	70,903	15,173
Cash and cash equivalents, at end of period	66,104	86,293
Supplemental disclosures of cash flow information:
Cash paid for taxes	$ 109	$ 0