Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities
Net loss	$ (3,887)	$ (8,781)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	1,102	170
(Gain) loss on sale of property and equipment	352	(599)
Impairment of property and equipment	49	64
Change in fair value of liability	(26)	(176)
Change in fair value of derivative liability	(309)
Stock-based compensation expense	222	2,301
Funding from SBA PPP loan recognized as income	(111)
Extinguishment of note payable		(3,540)
Amortization of note discount	882	5,605
Amortization of right-of-use asset	20
Non-cash interest expense	355
Termination of management agreements		536
Change in operating assets and liabilities
Prepaid expenses and other current assets	115	80
Intangible digital assets	14	12
Management agreement termination liability	(90)	(45)
Right of use asset	2	9
Operating lease liability	(22)	(6)
Other assets		66
Accounts payable	466	352
Accrued expenses	216	(8)
Net cash used in operating activities	(650)	(3,960)
Cash Flows From Investing Activities
Purchase of property and equipment	(376)	(3,646)
Proceeds from sale of property and equipment	686	535
Proceeds from sale of Bitcoin received for sale of equipment	53
Deposits made on property and equipment	(38)	(203)
Refund of security deposit	34
Net cash provided by (used in) investing activities	359	(3,314)
Cash Flows From Financing Activities
Proceeds from SBA PPP loan	111
Proceeds from the issuance of notes payable, net of original issue discount	200
Proceeds from sale of common stock		525
Payment of deferred offering costs		(70)
Proceeds from sale of stock under equity purchase agreement, net of issuance costs		5,053
Sale of preferred stock, net of issuance costs		1,990
Repayment of notes payable		(210)
Proceeds from exercise of warrants		120
Warrant buybacks		(14)
Net cash provided by financing activities	311	7,394
Net change in cash and cash equivalents	20	120
Cash and cash equivalents, beginning of year	216	96
Cash and cash equivalents, end of year	236	216
Supplemental disclosure of cash flow information
Cash paid for interest		3
Cash paid for income tax
Non-cash investing and financing activities
Reclassification of deposit to property plant and equipment	202
Deemed dividend on warrant modification and beneficial conversion feature of preferred stock		1,005
Cumulative effect adjustment related to ASU adoption		3
Conversion of notes payable into common stock	929	2,738
Repayment of note payable and interest through the issuance of shares under the equity purchase agreement		354
Acquisition of miners through common stock		311
Conversion of Series C convertible preferred stock into common stock		28
Reclassification of deferred offering costs		70
Debt discount on associated with convertible note	$ 230