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	$ (27,928)	$ (19,915)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	3,332	2,931
Depreciation and amortization	92	47
Other	29	(11)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(1,459)	406
Accounts payable	(297)	317
Accrued, other and operating lease liabilities	494	(736)
Net cash used in operating activities	(25,737)	(16,961)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(62)
Net cash used in investing activities	(62)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of common stock warrants	40,346	660
Proceeds from issuance of pre-funded warrants in a public offering	23,397
Proceeds from issuance of term loan, net of issuance costs	4,845
Proceeds from exercise of common stock options	4,572	288
Net cash provided by financing activities	195,065	20,580
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash		(16)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	169,266	3,603
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period	105,049	104,355
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period	274,315	107,958
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes, net	17	13
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Unpaid deferred financing costs in accrued and other liabilities	63	110
Follow-on Offering [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net of offering costs	$ 121,905
At-The-Market Offering [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net of offering costs		$ 19,632