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	$ (4,243)	$ (3,771)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	46	762
Depreciation and amortization	148	455
Impairment of assets held for sale	56	54
Change in fair value of common stock warrant liability	(528)	(5,105)
Gain on finance lease termination	(61)
Net (gain)/loss on sale of property and equipment and held for sale assets	31	(2)
Changes in operating assets and liabilities:
Accounts receivable		256
Prepaid expenses and other current assets	(1,086)	(393)
Operating lease right-of-use assets	322	292
Accounts payable and accrued expenses	352	1,702
Other current liabilities	1	(1)
Deferred revenue		(52)
Operating lease liabilities	(118)	(238)
Net cash used in operating activities	(5,080)	(6,041)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment		(31)
Proceeds from sale of property and equipment and held for sale assets	100	7
Net cash provided by/(used in) investing activities	100	(24)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from insurance financing arrangements		1,027
Principal payments on term note payable and financing arrangements		(10)
Principal payments on financing leases	(72)	(116)
Net proceeds from the sale of preferred stock and warrants		4,814
Cash paid for tax withholdings related to net share settlement		(127)
Net cash provided by/(used in) financing activities	(72)	5,588
Net decrease in cash and cash equivalents, including cash classified within assets held for sale	(5,052)	(477)
Less: net increase in cash and cash equivalents classified within assets held for sale		175
Net decrease in cash and cash equivalents	(5,052)	(652)
Cash and cash equivalents - beginning of period	11,446	19,375
Cash and cash equivalents - end of period	6,394	18,723
Supplemental cash flow information:
Cash paid for interest	7	16
Supplemental schedule of non-cash investing and financing activities:
Disposal of held for sale assets in exchange for extinguishment of finance lease liabilities	157
Fair value of placement agent warrants issued in connection with offerings		144
Conversion of Series A and Series B preferred stock into common stock		16
Allocation of proceeds to warrant liability		3,129
Deferred and accrued offering costs		104
Reclassification of assets held for sale		3,163
Reclassification of liabilities held for sale		$ 215