CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (9,410)	$ (9,005)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	551	469
Depreciation	7	1
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(690)	(530)
Accounts payable	1,377	3,985
Accrued liabilities	(1,375)	(811)
Net cash used in operating activities	(9,540)	(5,891)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	0	(40)
Net cash used in investing activities	0	(40)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the issuance of common stock, net of issuance costs	0	1,628
Proceeds from the exercise of warrants	0	8,969
Payments of taxes related to net share settlement of equity awards	(55)	0
Net cash provided by (used in) financing activities	(55)	10,597
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(9,595)	4,666
CASH AND CASH EQUIVALENTS—BEGINNING	26,884	30,115
CASH AND CASH EQUIVALENTS—ENDING	$ 17,289	$ 34,781