Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows From Operating Activities
Net loss	$ (11,054)	$ (10,126)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	1,189	196
Amortization of intangible assets		83
Stock-based compensation expense	3,908	3,896
Warrant modification expense	139
Stock issued for amendment of notes payable		118
Loss (gain) on sale of property and equipment	47	(48)
Loss on sale of cybersecurity assets	127
Impairment/loss on sale of investments		2,871
Accretion of debt discount	117	48
Change in operating assets and liabilities
Prepaid expenses and other current assets	438	67
Digital currencies	(203)	(7)
Other assets	(368)
Accounts payable	(223)	645
Accrued expenses	566	105
Net cash used in operating activities	(5,317)	(2,152)
Cash Flows From Investing Activities
Purchase of property and equipment	(6,994)	(1,339)
Proceeds from sale of cybersecurity assets	60
Proceeds from sale of property and equipment	427	310
Proceeds from sale of investments		26
Net cash used in investing activities	(6,507)	(1,003)
Cash Flows From Financing Activities
Proceeds from private placements of common stock	80	1,150
Payment of deferred offering costs	(83)
Proceeds from the issuance of notes payable, net of original issue discount	3,700
Proceeds from issuance of convertible notes payable and warrants, net		1,883
Proceeds from exercise of warrants	906	100
Net cash provided by financing activities	4,603	3,133
Net change in cash and cash equivalents	(7,221)	(22)
Cash and cash equivalents, beginning of period	9,519	345
Cash and cash equivalents, end of period	2,298	323
Supplemental disclosure of cash flow information
Cash paid for interest		7
Cash paid for income tax
Non-cash investing and financing activities
Conversion of convertible debt and accrued interest		1,875
Issuance of L2 commitment note		160
Deemed dividend on trigger of down round provision	2,514
Reclassification adjustment upon sale of available for sale investment in net loss		66
Stock issued for services not yet rendered	15
Beneficial conversion feature on convertible debt and warrants issued concurrent with debt		$ 1,504