Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (51,384)	$ (41,360)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	3,845	2,231
Depreciation expense	99	97
Amortization and accretion on investments	155	122
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(235)	(465)
Other assets		(60)
Accounts payable	389	313
Accrued expenses and other current liabilities	393	1,748
Operating lease assets and liabilities, net	(33)
Deferred rent		(24)
Net cash used in operating activities	(46,771)	(37,398)
Cash flows from investing activities:
Proceeds from maturities and sales of short-term investments	45,937	47,500
Purchases of short-term investments	(47,557)	(64,203)
Purchases of property and equipment	(12)	(18)
Net cash used in investing activities	(1,632)	(16,721)
Cash flows from financing activities:
Proceeds from initial public offering, net of underwriting discounts, commissions and offering costs		80,427
Proceeds from issuance of Series B convertible preferred stock, net of issuance costs		17,150
Proceeds from July 2021 Offering, net of underwriting discounts and commissions	47,000
Proceeds from ATM offering, net of underwriting discounts and commissions	1,819
Proceeds from exercise of options	860	1,022
Payment of issuance costs	(578)	(1,718)
Net cash provided by financing activities	49,101	96,881
Net increase in cash, cash equivalents and restricted cash	698	42,762
Cash, cash equivalents and restricted cash, beginning of period	47,786	5,024
Cash, cash equivalents and restricted cash, end of period	48,484	47,786
Supplemental disclosure of non-cash investing and financing activities:
Conversion of convertible preferred stock into common stock		94,893
Accretion of redeemable convertible preferred stock to redemption value		(7,858)
Reclassification of deferred offering costs from other assets to additional paid-in capital		(2,144)
Offering costs included in accounts payable and accrued expenses	1
Property and equipment purchases included in accrued expenses		12
Unrealized loss on investments	$ (20)	$ (28)