Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 1,257	$ 236
Prepaid expenses and other current assets	200	10
Intangible digital assets		4
Total current assets	1,457	250
Non-current assets
Property and equipment, at cost, net	1,203	1,872
Right of use asset, operating lease, net of accumulated amortization	40	56
Other assets	3	123
Total assets	2,703	2,301
Current liabilities
Accounts payable	91	1,261
Accrued expenses and other payables	119	242
Convertible note payable, net of discount		5
Operating lease liability	30	23
Warrant derivative liability	2,041
Derivative liability		246
Total current liabilities	2,281	1,777
Non-current liabilities
Operating lease liability	9	33
Total liabilities	2,290	1,810
Commitments and Contingencies (Note 10)
Stockholders’ Equity
Common stock, $0.001 par value; 2,500,000,000 shares authorized; 583,470,903 and 506,779,781 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively.	583	507
Additional paid-in capital	419,839	418,373
Accumulated deficit	(420,009)	(418,389)
Total stockholders’ equity	413	491
Total Liabilities and Stockholders’ Equity	2,703	2,301
Undesignated Preferred Stock [Member]
Stockholders’ Equity
Preferred stock value
Series B Preferred Stock [Member]
Stockholders’ Equity
Preferred stock value
Series C Convertible Preferred Stock [Member]
Stockholders’ Equity
Preferred stock value