Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (13,644)	$ (8,689)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	66	88
Stock-based compensation	1,041	838
Change in fair value of warrant liability	(763)	(2,750)
Operating lease, net	84	109
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(1,729)	(305)
Accounts payable	1,820	376
Accrued expenses and other current liabilities	319	(72)
Net cash used in operating activities	(12,806)	(10,405)
Cash flows from investing activities:
Purchase of fixed assets	(67)	0
Net cash used in investing activities	(67)	0
Cash flows from financing activities:
Proceeds from exercise of warrants	0	63
Payment of tax liability for vested restricted stock units	(12)	0
Proceeds from sale of common stock, net of issuance costs	0	74,685
Net cash (used in) provided by financing activities	(12)	74,748
Effect of exchange rate changes on cash and cash equivalents	(19)	(10)
Net change in cash and cash equivalents	(12,904)	64,333
Cash and cash equivalents, at beginning of period	70,903	15,173
Cash and cash equivalents, at end of period	57,999	79,506
Supplemental disclosures of cash flow information:
Purchases of property and equipment in accounts payable and accrued liabilities	$ 3	$ 0