Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss before noncontrolling interest	$ (9,424)	$ (5,942)
Adjustments to reconcile net loss before noncontrolling interest to net cash used in operating activities:
Depreciation expense	23	23
Share-based compensation expense	476	436
Change in fair value of investments	3,234
Change in fair value of warrants, related party	(492)	1,648
Changes in assets and liabilities:
Accounts receivable		156
Prepaid expenses and other assets	732	540
Accounts payable and accrued expenses	4,430	(1,173)
Contract liabilities		(987)
Net cash used in operating activities	(1,021)	(5,299)
Cash flows from financing activities:
Proceeds from issuance of Class A Common Stock, net of offering costs		8,038
Proceeds from exercise of stock options		47
Repayment of notes payable	(256)	(84)
Net cash (used in) provided by financing activities	(256)	8,001
Net (decrease) increase in cash, cash equivalents and restricted cash and cash equivalents	(1,277)	2,702
Total cash, cash equivalents and restricted cash and cash equivalents, beginning of period	13,415	5,747
Total cash, cash equivalents and restricted cash and cash equivalents, end of period	12,138	8,449
Non-cash activities:
Change in redemption value of noncontrolling interest	8,178	19,547
Redeemable Noncontrolling Interest [Member] | Noncontrolling Interest [Member]
Non-cash activities:
Change in redemption value of noncontrolling interest	$ (8,178)	$ (19,547)