Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (16,414)	$ (12,661)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	83	42
Forgiveness of paycheck protection program loan		(387)
Net amortization of premiums and discounts on investments	(21)	140
Stock-based compensation expense	1,217	993
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	1,076	1,280
Other assets		(24)
Accounts payable	531	(583)
Operating lease liabilities	(62)	(7)
Accrued expenses and other current liabilities	105	968
Net cash used in operating activities	(13,485)	(10,239)
Cash flows from investing activities:
Purchases of property and equipment		(152)
Purchases of investments	(12,098)	(51,105)
Proceeds from sales or maturities of investments	29,611	9,000
Net cash provided by (used in) investing activities	17,513	(42,257)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs		55,583
Proceeds from exercise of stock options		47
Net cash provided by financing activities		55,630
Net increase in cash, cash equivalents and restricted cash	4,028	3,134
Cash, cash equivalents and restricted cash at beginning of period	3,625	7,639
Cash, cash equivalents and restricted cash at end of period	$ 7,653	$ 10,773