Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net loss	$ (9,827)	$ (20,577)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	195	224
Amortization of right-of-use asset	110	33
Share-based compensation	2,257	2,637
Changes in operating assets and liabilities:
Prepaid expenses and other assets	1,216	4,448
Accounts payable	1,276	2,182
Accrued expenses and other current liabilities	(33)	(3,342)
Deferred revenue	23,373
Other long-term liabilities	(62)	(41)
Net cash provided by (used in) operating activities	18,505	(14,436)
Cash flows from investing activities:
Purchases of property and equipment	(446)	(176)
Net cash used in investing activities	(446)	(176)
Cash flows from financing activities:
Proceeds from exercise of stock options		32
Proceeds from issuance of common stock under ATM, net	34
Net cash provided by financing activities	34	32
Net increase (decrease) in cash and cash equivalents and restricted cash	18,093	(14,580)
Cash and cash equivalents and restricted cash at beginning of period	20,423	49,329
Cash and cash equivalents and restricted cash at end of period	38,516	$ 34,749
Supplemental disclosures of cash flow information:
Issuance of common stock to certain board of directors in lieu of accrued compensation	221
Property and equipment included in accounts payable	23
Deferred offering costs in accrued expenses and other current liabilities	100
Property and equipment included accrued expenses and other current liabilities	$ 248