CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net loss	$ (58,365)	$ (21,822)	$ (20,243)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	229	102	61
Non-cash interest expense	78	721	1,734
Non-cash lease expense	360	189	250
In-process research and development	0	7,000	0
Change in fair value of derivative liability	0	0	3,187
Stock-based compensation expense	6,958	660	884
Loss on debt conversion	0	0	341
Income tax benefit	(52)	0	0
Gain on forgiveness of PPP Note	(426)	0	0
Impairment on note receivable	761	0	0
Other non-cash	26	(349)	5
Changes in assets and liabilities:
Prepaid expenses and other current assets	(742)	(370)	(1,007)
Accounts payable and accrued expenses	3,498	(541)	(1,629)
Other assets	100	(104)	(227)
Lease obligations	(366)	(195)	(249)
Net cash used in operating activities	(47,941)	(14,709)	(16,893)
Cash flows from investing activities
Purchase of property and equipment	(939)	(307)	(30)
Payments for asset acquisitions	(127)	0	(2,327)
Issuance of note receivable	(750)	0	0
Net cash used in investing activities	(1,816)	(307)	(2,357)
Cash flows from financing activities
Proceeds from issuance of common stock	129,211	37,822	1,183
Payment of equity issuance costs	(8,525)	(1,477)	0
Purchases of treasury stock	0	0	(48)
Proceeds from Pre-Merger Financing	0	0	22,546
Proceeds from issuance of debt	0	921	6,800
Payments of debt issuance costs	0	(6)	(99)
Repayments of debt	0	(5,625)	(5,290)
Financing lease principal payments	(10)	(24)	(26)
Net cash provided by financing activities	120,676	31,611	25,066
Net increase in cash, cash equivalents, and restricted cash	70,919	16,595	5,816
Cash, cash equivalents, and restricted cash at beginning of period	24,190	7,595	1,779
Cash, cash equivalents, and restricted cash at end of period	95,109	24,190	7,595
Supplemental disclosure of non-cash investing and financing transactions:
Exercise of warrants	603	0	0
Series B Convertible Preferred Stock issuance	4,988	0	0
Forgiveness of PPP Note	426	0	0
Purchase of property and equipment	16	214	0
Right-of-use assets related to operating leases	1,226	180	470
Issuance of Warrant Exchange Promissory Notes	0	5,625	0
Obligation settled with common stock	0	331	0
Conversion of convertible notes	0	0	13,980
Reverse asset acquisition costs	0	4	1,150
Reverse asset acquisition costs	$ 0	$ 0	$ 2,253