COMMITMENTS AND CONTINGENCIES (Details)				3 Months Ended		6 Months Ended
	Aug. 24, 2017 USD ($) patent	Apr. 21, 2017 USD ($) installment	Nov. 21, 2013 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) installment	Jun. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Feb. 23, 2018 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Investments [Line Items]
Future minimum payments, operating leases				$ 140,000		$ 140,000
Deferred rent payable				7,000		7,000				$ 36,000
Rent expense				145,000	$ 181,000	286,000	$ 375,000
Rental income				42,000	89,000	84,000	177,000
Future minimum sublease payments				40,000		40,000
Initial payment made						1,000,000	$ 0
Patents				26,070,000		26,070,000				$ 26,552,000
Amortization of intangible assets				500,000		800,000
Avira, Inc.
Schedule of Investments [Line Items]
Sale of patent in license agreement		$ 3,900,000				$ 2,600,000
Number of quarterly installments | installment		12				8
Installment amount payable		$ 325,000
Payable period of agreement		3 years
Venture Capital Funds
Schedule of Investments [Line Items]
Capital commitment			$ 5,000,000	2,200,000		$ 2,200,000
Percentage of limited partnership interest			10.00%
Cash call									$ 500,000
Patents | Finjan Blue
Schedule of Investments [Line Items]
Number of assets transferred | patent	41
Patents acquired	$ 8,500,000
Initial payment made	2,000,000
Cash payable over subsequent four years	$ 6,500,000
Useful life of intangible asset	4 years
Patents								$ 7,000,000
Adjustment, present value								$ 1,400,000
Accretion expense				100,000		500,000
Amortization of intangible assets				$ 600,000	$ 0	$ 800,000