Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows From Operating Activities
Net loss	$ (18,827)	$ (26,590)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	2,618	385
Impairment of property and equipment	3,668
Amortization of intangible assets		124
Stock-based compensation expense	5,417	11,856
Stock issued for amendment of notes payable		118
Warrant modification expense	139
Impairment of long-term investments		(2,871)
Amortization of debt discount	455	1,071
Loss (gain) on sale of property and equipment	47	(57)
Loss on sale of cybersecurity assets	127
Inducement expense		5,764
Change in operating assets and liabilities
Prepaid expenses and other current assets	530	(681)
Digital currencies	31	(7)
Accounts payable	12	1,797
Accrued expenses	(1,385)	258
Net cash used in operating activities	(7,168)	(3,092)
Cash Flows From Investing Activities
Proceeds from sale of cybersecurity assets	60
Proceeds from sale of investments		26
Purchase of property and equipment	(6,994)	(3,897)
Proceeds from sale of property and equipment	427	440
Net cash used in investing activities	(6,507)	(3,431)
Cash Flows From Financing Activities
Proceeds from issuance of convertible notes payable and warrants		4,971
Proceeds from private placements of common stock	80	1,150
Proceeds from sale of common stock warrants		100
Proceeds from sale of stock under equity purchase agreement	365
Payment of deferred offering costs	(141)
Proceeds from the issuance of notes payable, net of original issue discount	4,700
Repayment of notes payable	(1,480)
Proceeds from exercise of warrants	907
Net cash provided by financing activities	4,431	6,221
Net change in cash and cash equivalents	(9,244)	(302)
Cash and cash equivalents, beginning of period	9,519	345
Cash and cash equivalents, end of period	275	43
Supplemental disclosure of cash flow information
Cash paid for interest		48
Cash paid for income tax
Non-cash investing and financing activities
Conversion of convertible debt and accrued interest		3,935
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	2
Beneficial conversion feature on convertible debt and warrants issued concurrent with debt		4,593
Repayment of notes payable using proceeds from equity purchase agreement	366
Shares issued in settlement of accounts payable		401
Shares issued for prepaid services		343
Reclassification of deferred offering costs	$ 160