Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES - Narrative (Details)

v3.8.0.1
COMMITMENTS AND CONTINGENCIES - Narrative (Details)
3 Months Ended 9 Months Ended
Aug. 24, 2017
USD ($)
Apr. 21, 2017
USD ($)
installment
Jun. 08, 2015
USD ($)
Nov. 21, 2013
USD ($)
Sep. 30, 2017
USD ($)
installment
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Investments [Line Items]                    
Deferred rent payable         $ 41,000     $ 41,000   $ 69,000
Rent expense         197,000   $ 188,000 573,000 $ 586,000  
Rental income         89,000   88,000 267,000 260,000  
Cash investments               0 550,000  
Initial payment made               2,000,000 0  
Avira, Inc.                    
Schedule of Investments [Line Items]                    
Sale of patent in license agreement   $ 3,900,000     $ 3,600,000          
Number of quarterly installments | installment   12     11          
Installment amount payable   $ 325,000                
Payable period of agreement   3 years                
Venture Capital Funds                    
Schedule of Investments [Line Items]                    
Capital commitment       $ 5,000,000 $ 2,700,000     2,700,000    
Percentage of limited partnership interest       10.00%            
Cash distribution     $ 800,000              
Gross entitlement     1,300,000              
Remainder of gross entitlement reinvested     500,000              
Cash investments     2,300,000              
Total investment     $ 2,600,000              
Distribution received from JVP           $ 130,000        
Patents | Finjan Blue                    
Schedule of Investments [Line Items]                    
Patents acquired $ 8,500,000                  
Initial payment made 2,000,000                  
Cash payable over subsequent four years $ 6,500,000                  
Amortization of intangible assets         $ 200,000   $ 0 $ 200,000 $ 0  
Useful life of intangible asset               4 years