Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (4,270)	$ (11,653)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	94	111
Amortization of right-of-use asset	54	25
Share-based compensation	1,224	1,310
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	214	3,973
Accounts payable	687	788
Accrued expenses and other current liabilities	(1,404)	(912)
Deferred revenue	27,636
Other long-term liabilities	(62)	(18)
Net cash provided by (used in) operating activities	24,173	(6,376)
Cash flows from investing activities:
Purchases of property and equipment	(106)	(6)
Net cash used in investing activities	(106)	(6)
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	24,101	(6,350)
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	44,524	42,979
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	$ 223
Offering costs included in accrued expenses and other liabilities		25
Offering costs included in accounts payable		25
Property and equipment included in accrued expenses and other current liabilities		$ 3