Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (10,785)	$ (11,540)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	30	27
Stock-based compensation	1,088	573
Amortization of right of use assets	26	77
Amortization of debt discounts and issuance costs	0	3
Change in fair value of warrant liability	(7,408)	7,935
Loss on sale of property and equipment	0	28
Changes in operating assets and liabilities
Accounts receivable	(64)	0
Inventory	(1,381)	0
Prepaid expenses and other assets	280	138
Accounts payable and accrued liabilities	2,116	100
Accrued bonuses	(769)	(938)
Accrued interest	0	(597)
Other current and long-term liabilities	(26)	(88)
Net cash used in operating activities	(16,893)	(4,282)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from issuance of common stock	0	66,882
Repayments of long-term debt	0	(625)
Net cash provided by financing activities	0	66,257
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(16,893)	61,975
Cash and cash equivalents, beginning of period	69,392	22,449
Cash and cash equivalents, end of period	52,499	84,424
SUPPLEMENTAL INFORMATION
Income taxes	0	0
Interest	0	602
NON-CASH INVESTING AND FINANCING TRANSACTIONS
Preferred stock dividends	$ 0	$ 322