Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (22,782)	$ (19,365)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	126	81
Forgiveness of paycheck protection program loan		(387)
Net amortization of premiums and discounts on investments	(85)	212
Stock-based compensation expense	1,659	1,653
Gain on sale of property and equipment		(66)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	667	(238)
Other assets		(24)
Accounts payable	(265)	(564)
Operating lease liabilities	(95)	(36)
Accrued expenses and other current liabilities	319	1,235
Net cash used in operating activities	(20,456)	(17,499)
Cash flows from investing activities:
Purchases of property and equipment		(157)
Proceeds from sale of property and equipment		66
Purchases of investments	(19,912)	(70,828)
Proceeds from sales or maturities of investments	41,607	32,751
Net cash provided by (used in) investing activities	21,695	(38,168)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs		55,583
Proceeds from exercise of stock options		73
Net cash provided by financing activities		55,656
Net increase (decrease) in cash, cash equivalents and restricted cash	1,239	(11)
Cash, cash equivalents and restricted cash at beginning of period	3,625	7,639
Cash, cash equivalents and restricted cash at end of period	$ 4,864	$ 7,628