Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash Flows From Operating Activities
Net loss	$ (50,433)	$ (24,842)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	946	126
Amortization of intangible assets	165	83
Stock-based compensation expense	16,574	11,662
Stock issued for amendment of notes payable	118
Warrant modification expense		431
Loss on sale of investments - short term	84	1,410
Impairment of investments	2,787	1,358
Impairment of goodwill and intangible assets	303	2,169
Accretion of debt discount	5,627	41
Gain on sale of property and equipment	(370)
Inducement expense	20,312
Change in operating assets and liabilities
Prepaid expenses and other current assets	(581)	(92)
Digital currencies	(38)	(10)
Accounts payable	622	3
Accrued expenses	1,507	119
Net cash used in operating activities	(2,377)	(5,528)
Cash Flows From Investing Activities
Release of restricted cash and security deposit		39
Purchase of investments		(679)
Purchase of note receivable		(45)
Proceeds from sale of investments	26	2,165
Purchase of property and equipment	(4,067)	(693)
Proceeds from sale of property and equipment	976
Net cash (used in) provided by investing activities	(3,065)	787
Cash Flows From Financing Activities
Proceeds from private placements of common stock	9,150
Proceeds from issuance of convertible notes payable and warrants	4,971	2,300
Proceeds from exercise of warrants	395
Proceeds from sale of common stock warrants	100	2,427
Net cash provided by financing activities	14,616	4,727
Net change in cash and cash equivalents	9,174	(14)
Cash and cash equivalents, beginning of year	345	359
Cash and cash equivalents, end of year	9,519	345
Supplemental disclosure of cash flow information:
Cash paid for interest	48	104
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
Transfers from the non-controlling interest		292
Reclassification adjustment upon sale of available for sale investment in net loss	66	1,453
Unrealized gain on available for sale investments		(313)
Stock issued for acquisitions of intangible assets		495
Fair value of warrants issued in connection with Notes payable		761
Conversion of notes receivable into investments		1,379
Beneficial conversion feature on convertible debt and warrants issued concurrent with debt	4,593
Shares issued in satisfaction of accounts payable	$ 401