Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash Flows From Operating Activities
Net loss	$ (23,849)	$ (50,433)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	3,291	946
Impairment of property and equipment	6,345
Amortization of intangible assets		165
Stock-based compensation expense	6,402	16,574
Stock issued for amendment of notes payable		118
Warrant modification expense	139
Loss on sale of investments - short term		84
Loss on sale of business unit	127
Impairment of long-term investments		2,787
Extinguishment of note payable	(1,295)
Accretion of debt discount	905	5,627
Impairment of intangible assets		303
Loss (gain) on sale of property and equipment	47	(370)
Inducement expense		20,312
Change in operating assets and liabilities
Prepaid expenses and other current assets	514	(581)
Intangible digital assets	18	(38)
Other assets	(204)
Accounts payable	210	622
Accrued expenses	(1,413)	1,507
Net cash used in operating activities	(8,763)	(2,377)
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)	(4,067)
Proceeds from sale of property and equipment	427	976
Net cash used in investing activities	(6,507)	(3,065)
Cash Flows From Financing Activities
Proceeds from issuance of convertible notes payable and warrants		4,971
Proceeds from private placements of common stock	80	9,150
Proceeds from sale of common stock warrants		100
Proceeds from sale of stock under equity purchase agreement	1,309
Proceeds from the issuance of notes payable, net of original issue discount	5,200
Repayment of notes payable	(1,649)
Proceeds from exercise of warrants	907	395
Net cash provided by financing activities	5,847	14,616
Net change in cash and cash equivalents	(9,423)	9,174
Cash and cash equivalents, beginning of year	9,519	345
Cash and cash equivalents, end of year	96	9,519
Supplemental disclosure of cash flow information
Cash paid for interest	14	48
Cash paid for income tax
Non-cash investing and financing activities
Conversion of convertible debt and accrued interest		8,680
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
Beneficial conversion feature on convertible debt and warrants issued concurrent with debt		4,593
Shares issued in settlement of accounts payable		401
Reclassification of deferred offering costs	160
Reclassification of NCI to accumulated deficit	22
Repayment of notes payable through issuance of shares under equity purchase agreement	$ 1,310