Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash Flows from Operating Activities:
Net loss	$ (5,023)	$ (21,558)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	352	33
Non-cash stock compensation expense	930	1,500
Non-cash lease expense	101
Non-cash interest expense	44	39
Change in fair value of warrant liability	(13,256)	12,369
Paycheck protection program loan forgiveness		(464)
Accretion of debt discount	115
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	1,760	(18)
Accounts payable	(161)	(177)
Accrued expenses	276	(1,228)
Deferred revenue	(63)	(63)
Deferred rent		(13)
Lease liability	(225)
Other long term assets		(506)
Net cash used in operating activities	(15,150)	(10,086)
Cash Flows from Investing Activities:
Purchase of fixed assets	(806)	(939)
Net cash (used in) provided by investing activities	(806)	(939)
Cash Flows from Financing Activities:
Net proceeds from bank term loan	19,910
Proceeds from option exercises	28	35
Proceeds from warrant exercises		410
Net cash provided by financing activities	19,938	445
Net increase (decrease) in cash	3,982	(10,580)
Cash, cash equivalents and restricted cash at beginning of period	83,066	35,319
Cash, cash equivalents and restricted cash at end of period	87,048	24,739
Supplemental cash flow information:
Cash paid for taxes	133	21
Cash paid for interest	328
Supplemental disclosures of non-cash information:
Lease liability arising from obtaining right-of-use assets	2,368
Capital expenditures in accounts payable and accrued expenses	254	$ 1,612
Common stock exchange for option exercise	$ 448