Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows From Operating Activities
Net loss	$ (1,620)	$ (3,332)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	548	902
Gain (loss) on sale of property and equipment	(264)	410
Loss on settlement of debt	541
Change in fair value of warrant derivative liability	(451)
Change in fair value of derivative liability	79
Change in fair value of liability		(26)
Stock-based compensation expense		222
Amortization of note discount	526	877
Gain on settlement of payables	(675)
Non-operating expense	306
Non-cash interest expense	270
Change in operating assets and liabilities
Prepaid expenses and other current assets	(190)	63
Intangible digital assets	4	16
Management agreement termination liability		(90)
Operating lease liability	(1)
Other assets	120	(2)
Accounts payable	(495)	457
Accrued expenses	(52)	122
Net cash used in operating activities	(1,354)	(381)
Cash Flows From Investing Activities
Purchase of property and equipment	(41)	(375)
Proceeds from sale of property and equipment	426	439
Deposits made on property and equipment		(38)
Refund of security deposit		34
Net cash provided by investing activities	385	60
Cash Flows From Financing Activities
Proceeds from convertible note payable	1,000
Proceeds from sale of stock under equity purchase agreement, net of issuance costs	990
Proceeds from SBA PPP bank loan		111
Net cash provided by financing activities	1,990	111
Net change in cash and cash equivalents	1,021	(210)
Cash and cash equivalents, beginning of period	236	216
Cash and cash equivalents, end of period	1,257	6
Supplemental disclosure of cash flow information
Cash paid for interest
Cash paid for income tax
Non-cash investing and financing activities
Conversion of notes payable into common stock	230	929
Exchange of notes payable to warrants	$ 1,210