Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (11,653)	$ (3,898)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	111	176
Amortization of right-of-use asset	25
Share-based compensation	1,310	325
Deferred rent	(12)	(1)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	3,985	(1,703)
Accounts payable	788	1,771
Accrued expenses and other current liabilities	(912)	(205)
Other long term liabilities	(18)
Net cash used in operating activities	(6,376)	(3,535)
Cash flows from investing activities:
Purchases of property and equipment	(6)	(31)
Net cash used in investing activities	(6)	(31)
Cash flows from financing activities:
Proceeds from exercise of stock options	32	6
Proceeds from sale of common stock and common stock warrants		105
Payment of equipment loan payable		(35)
Net cash provided by financing activities	32	76
Net increase in cash and cash equivalents and restricted cash	(6,350)	(3,490)
Cash and cash equivalents and restricted cash at beginning of year	49,329	39,866
Cash and cash equivalents and restricted cash at end of year	42,979	36,376
Supplemental disclosures of cash flow information:
Operating lease right-of-use asset and lease liability recorded upon adoption of ASC 842	215
Offering costs included in accrued expenses and other liabilities	25
Offering costs included in accounts payable	25
Fixed assets included in accrued expenses and other current liabilities	$ 3
Cash paid for interest		$ 2