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	$ (4,786)	$ (3,538)
Adjustments to reconcile net loss to net cash used in operating activities
Compensation cost for stock options granted	1,806	640
Depreciation and amortization	2	9
Changes in operating assets and liabilities:
Prepaid expenses	(1,386)	(737)
Research and development rebate receivable	404	(85)
Other assets	(114)	582
Accounts payable	(121)	(866)
Accrued expenses	(84)	58
Payroll liabilities	(591)	(474)
Other current liabilities	(8)	3
Net cash used in operating activities	(4,878)	(4,408)
CASH FLOWS FROM INVESTING ACTIVITY
Purchase of furniture and equipment	(13)	0
Net cash used in investing activities	(13)	0
CASH FLOWS FROM FINANCING ACTIVITY
Proceeds from issuance of common stock, net of issuance costs	0	69,668
Proceeds from exercise of warrants	0	32,760
Net cash provided by financing activities	0	102,428
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(4,891)	98,020
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING BALANCE	136,487	39,664
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, ENDING BALANCE	131,596	137,684
SUPPLEMENTAL DISCLOSURES
Cash and cash equivalents	131,486	137,574
Restricted cash	110	110
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	131,596	137,684
NONCASH INVESTING AND FINANCING ACTIVITIES
Reclassification of the warrant liability to equity upon adoption of accounting standard	0	13,003
Conversion of Series B Convertible Preferred Stock into Common Stock [Member]
NONCASH INVESTING AND FINANCING ACTIVITIES
Conversion of Series B convertible preferred stock to common stock	$ 0	$ 1