Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Cash flows used in operating activities:
Net loss used in the calculation of basic and diluted loss per share	$ (9,579)	$ (10,772)	$ (9,247)	$ (9,864)	$ (20,351)	$ (19,111)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of operating lease asset					186	187
Accretion on Investment Discounts					(97)
Stock-based compensation	1,720		2,308		3,101	4,494
Changes in operating assets and liabilities:
Prepaid expenses and other assets					791	1,282
Accounts payable, accrued expenses and other liabilities					(1,603)	(1,042)
Operating lease liabilities					(172)	(183)
Net cash used in operating activities					(18,145)	(14,373)
Cash flows from investing activities:
Purchase of available-for-sale short-term investments					(30,334)
Net cash used in investing activities					(30,334)
Cash flows from financing activities:
Proceeds from issuances of common stock and pre-funded warrants, net					33,017
Net cash used in financing activities					33,017
Net change in cash and cash equivalents					(15,462)	(14,373)
Cash and cash equivalents at beginning of period		$ 56,409		$ 84,833	56,409	84,833
Cash and cash equivalents at end of period	$ 40,947		$ 70,460		40,947	70,460
Noncash activities:
Common stock exchanged for X and X1 non-voting convertible preferred stock					$ 1	$ 1