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	$ (11,813)	$ (11,636)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	617	867
Depreciation expense	125	65
Non-cash interest expense	41	9
Non-cash lease expense	97	83
Changes in assets and liabilities:
Prepaid expenses and other current assets	(8,284)	(17)
Accounts payable	2,052	468
Accrued expenses	(2,793)	199
Operating lease liabilities	(79)	(74)
Net cash used in operating activities	(20,037)	(10,036)
Cash flows from investing activities:
Purchases of property and equipment		(422)
Net cash used in investing activities		(422)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net of issuance costs	3,944	11,703
Repayment of loan payable	(5,000)
Net cash (used in) provided by financing activities	(1,056)	11,703
Net (decrease) increase in cash and cash equivalents	(21,093)	1,245
Cash and cash equivalents, beginning of period	29,988	35,042
Cash and cash equivalents, end of period	$ 8,895	36,287
Supplemental disclosures:
Property and equipment purchases included in accounts payable		$ 6