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	$ (20,248)	$ (25,608)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,177	1,827
Depreciation expense	243	145
Loss on issuance of securities	371
Change in valuation of warrant liability	1,023
Non-cash interest expense	52	27
Non-cash lease expense	189	190
Changes in assets and liabilities:
Prepaid expenses and other current assets	(6,879)	542
Other assets		(50)
Accounts payable	1,241	124
Accrued expenses	(1,610)	1,555
Operating lease liabilities	(153)	(150)
Net cash used in operating activities	(24,594)	(21,398)
Cash flows from investing activities:
Purchases of property and equipment		(457)
Net cash used in investing activities		(457)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net of issuance costs	3,944	13,464
Proceeds from the issuance of convertible preferred stock, net of issuance costs	2,251
Proceeds from issuance of stock through ESPP		5
Repayment of loan payable	(5,000)
Net cash provided by financing activities	1,195	13,469
Net decrease in cash and cash equivalents	(23,399)	(8,386)
Cash and cash equivalents, beginning of period	29,988	35,042
Cash and cash equivalents, end of period	$ 6,589	26,656
Supplemental disclosures:
Issuance costs included in accounts payable and accrued expenses		$ 10