CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net loss	$ (12,405)	$ (7,972)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,515	1,349
Depreciation and amortization	157	98
Accretion on marketable securities	197
Interest on finance lease	46	3
Non-cash lease expense	291
Amortization of financing lease right-of-use assets	177
Realized gain on marketable securities	(15)
Changes in operating assets and liabilities:
Prepaid expenses	(2,007)	(1,992)
Other assets	175	50
Accounts payable and accrued liabilities	2,644	(1,880)
Compensation and employee benefits	(1,193)	(475)
Operating lease liabilities	(271)
Other liabilities	(15)	52
Net cash used in operating activities	(10,750)	(10,767)
Investing activities
Purchases of property and equipment	(19)	(487)
Purchases of short-term investments	(8,017)
Sales of short-term investments	12,365
Maturities of short-term investments	7,864
Net cash provided by (used in) investing activities	12,193	(487)
Financing activities
Principle payments from financing leases	(133)	(10)
Proceeds from the exercise of common stock options	238	1
Employee stock purchase plan expense	14
Proceeds from issuance of common stock upon initial public offering, net of issuance costs		140,594
Net cash provided by financing activities	119	164,076
Net increase in cash and cash equivalents	1,562	152,822
Cash and cash equivalents at beginning of period	7,159	16,596
Cash and cash equivalents at end of period	8,721	169,418
Supplemental disclosure of noncash financing information:
Property and equipment additions included in accounts payable and accrued liabilities	11	15
Deferred offering costs included in accounts payable and accrued liabilities		534
Interest on financing		3
Initial measurement of operating lease right-of-use assets	6,558
Initial measurement of operating lease liabilities	5,580
Initial measurement of finance lease right-of-use assets	$ 411
Series BB Convertible Preferred Stock
Financing activities
Proceeds on the issuance of convertible preferred stock		23,491
Conversion of Series AA and BB Convertible Preferred Stock into Common Stock
Supplemental disclosure of noncash financing information:
Conversion of stock		$ 95,826