Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows From Operating Activities
Net loss	$ (581)	$ (1,324)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	189	342
Gain on sale of property and equipment	(1)	(30)
Change in fair value of liability	67	(15)
Stock-based compensation expense		220
Amortization of note discount	62	421
Change in operating assets and liabilities
Prepaid expenses and other current assets	(2)	57
Intangible digital assets	(2)	6
Management agreement termination liability		(44)
Right of use asset	5	9
Operating lease liability	(5)	(9)
Accounts payable	301	453
Accrued expenses	(212)	97
Net cash provided by (used) in operating activities	(179)	183
Cash Flows From Investing Activities
Purchase of property and equipment		(343)
Proceeds from sale of property and equipment	131
Deposits made on property and equipment		(38)
Net cash provided by (used in) investing activities	131	(381)
Cash Flows From Financing Activities
Proceeds from convertible note payable	1,000
Net cash provided by financing activities	1,000
Net change in cash and cash equivalents	952	(198)
Cash and cash equivalents, beginning of period	236	216
Cash and cash equivalents, end of period	1,188	18
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		$ 350
Discount related to convertible promissory note	$ 1,000