ACCOUNTING POLICIES (Details 3)	1 Months Ended	3 Months Ended		6 Months Ended			12 Months Ended
	Aug. 06, 2018 USD ($)	Jun. 30, 2018 USD ($) investment	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) investment	Jun. 30, 2018 USD ($) investment	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) investment	Jun. 30, 2017 USD ($)	Mar. 31, 2018	Dec. 31, 2017 USD ($)
Fixed assets
Impairment of long-lived assets					$ 0	$ 0
Depreciation
Depreciation of fixed assets		$ 6,402,000	$ 7,211,000		12,983,000	14,909,000	$ 26,922,000	$ 29,896,000
Accumulated depreciation of fixed assets		$ 198,400,000		$ 198,400,000	$ 198,400,000		$ 198,400,000			$ 186,400,000
Equity investments under ASC 321
Number of equity investments under ASC 321 | investment		12		12	12		12
Carrying amount of equity investments under ASC 321		$ 18,600,000		$ 18,600,000	$ 18,600,000		$ 18,600,000			6,500,000
Unrealized gains on investments carried at fair value		$ 1,800,000			1,800,000
Impairment losses for equity investments under ASC 321					$ 0	4,500,000
Equity method investments
Number of equity method investments | investment		6		6	6		6
Equity Investments		$ 25,000,000		$ 25,000,000	$ 25,000,000		$ 25,000,000			6,500,000
Noncontrolling Interest
Proceeds from security token offering				95,900,000
Capitalized offering costs for security token offering		16,500,000		16,500,000	16,500,000		16,500,000
Goodwill
Impairments of goodwill					0	0
Goodwill acquired during period					7,400,000
Cryptocurrencies
Impairment of cryptocurrencies		702,000	0		9,491,000	0	9,491,000	0
Realized gain on sale of cryptocurrencies		6,800,000	0		8,348,000	0	10,343,000	$ 0
Cryptocurrency
Cryptocurrencies
Other assets, current		3,000,000		3,000,000	3,000,000		3,000,000			1,500,000
Cost of goods sold — direct
Depreciation
Depreciation of fixed assets		83,000	75,000		167,000	158,000
Technology
Depreciation
Depreciation of fixed assets		5,296,000	6,177,000		10,772,000	12,862,000
General and administrative
Depreciation
Depreciation of fixed assets		1,023,000	959,000		$ 2,044,000	1,889,000
Building
Fixed assets
Life					40 years
Land improvements
Fixed assets
Life					20 years
Building machinery and equipment | Minimum
Fixed assets
Life					15 years
Building machinery and equipment | Maximum
Fixed assets
Life					20 years
Furniture and equipment | Minimum
Fixed assets
Life					5 years
Furniture and equipment | Maximum
Fixed assets
Life					7 years
Computer hardware | Minimum
Fixed assets
Life					3 years
Computer hardware | Maximum
Fixed assets
Life					4 years
Computer software | Minimum
Fixed assets
Life					2 years
Computer software | Maximum
Fixed assets
Life					4 years
Internal-use software and website development
Additional Disclosure
Capitalized costs		8,300,000	2,400,000		$ 10,600,000	5,900,000
Amortization of capitalized costs		3,200,000	4,100,000		6,700,000	8,300,000
Equipment under capital leases
Depreciation
Depreciation of fixed assets		120,000	$ 1,100,000		264,000	$ 2,400,000
Accumulated depreciation of fixed assets		722,000		722,000	722,000		722,000			458,000
Additional Disclosure
Capital lease obligations		$ 1,800,000		$ 1,800,000	$ 1,800,000		$ 1,800,000			$ 1,800,000
tZero.com, Inc. | Verify Investors, LLC
Noncontrolling Interest
Percentage of voting Interests acquired									81.00%
ES Capital Advisors, LLC | tZero.com, Inc.
Noncontrolling Interest
Noncontrolling interest, ownership percentage by parent									65.80%
Subsequent Event
Noncontrolling Interest
Proceeds from security token offering	$ 7,500,000