Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss before noncontrolling interest	$ (5,774)	$ (9,424)
Adjustments to reconcile net loss before noncontrolling interest to net cash used in operating activities:
Depreciation expense	22	23
Loss from promissory note early redemption	313	0
Non-cash interest income	(100)	0
Share-based compensation expense	343	476
Change in fair value of investments	(2,104)	3,234
Change in fair value of warrants, related party	238	(492)
Changes in assets and liabilities:
Accounts receivable	173	0
Prepaid expenses and other assets	691	732
Accounts payable and accrued expenses	1,032	4,430
Net cash used in operating activities	(5,166)	(1,021)
Cash flows from financing activities:
Proceeds from promissory note early redemption related to sale of Class A common stock to collaboration partner	12,030	0
Repayment of notes payable	(224)	(256)
Net cash provided by (used in) financing activities	11,806	(256)
Net increase/(decrease) in cash and cash equivalents	6,640	(1,277)
Total cash and cash equivalents, beginning of period	12,126	13,415
Total cash and cash equivalents, end of period	18,766	12,138
Non-cash activities:
Change in redemption value of noncontrolling interest	$ 4,296	$ (8,178)