Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net loss	$ (21,872)	$ (25,675)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	1,007	1,003
Stock-based compensation	1,895	1,007
Non-cash operating lease expense	745	628
Amortization of premium on marketable securities, net	235	0
Change in fair value of warrant liabilities	(6,919)	0
Other expense related to the commitment shares issued to Lincoln Park	273	0
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	1,309	(747)
Other assets	(418)	(1)
Accounts payable	(2,278)	(637)
Accrued and other liabilities	(2,590)	2,245
Operating Lease liabilities	(1,174)	(1,035)
Net cash used in operating activities	(29,787)	(23,212)
Investing activities:
Purchases of property and equipment	(435)	(404)
Purchases of marketable securities	0	(1,098)
Proceeds from maturities of marketable securities	14,000	8,700
Net cash provided by investing activities	13,565	7,198
Financing activities:
Proceeds from exercise of stock options	0	305
Repurchase of early exercised stock options	(3)	(1)
Payments of deferred transaction costs	0	(422)
Net cash used in financing activities	(3)	(118)
Net decrease in cash, cash equivalents and restricted cash	(16,225)	(16,132)
Cash, cash equivalents and restricted cash at beginning of period	33,496	35,387
Cash, cash equivalents and restricted cash at end of period	17,271	19,255
Supplemental disclosure of noncash investing and financing activities:
Purchases of property and equipment included in accounts payable	0	156
Vesting of early exercises of stock options	57	77
Reclassification of early exercised stock options to liability	0	185
Deferred transaction costs included in accounts payable and accrued liabilities	0	922
Reconciliation Of Cash Cash Equivalents And Restricted Cash To Consolidated Balance Sheets Abstract
Cash and cash equivalents	16,866	18,850
Restricted cash	405	405
Cash, cash equivalents and restricted cash	$ 17,271	$ 19,255