Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES - Legal Fees (Details Narrative)

v2.4.1.9
COMMITMENTS AND CONTINGENCIES - Legal Fees (Details Narrative) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Legal Service Agreement With Russ, August Kabot For Litigation Filed In April 2014 and December 2014 [Member]    
Legal Fees payment ,Terms Legal fees on a full contingency basis ranging from 15% to 30% of the net recovery (after deduction of expenses)  
Legal Service Agreement With Dovel And Luner For Litigation Settlement In May 2013 [Member]    
Legal Fees payment ,Terms Legal fees on a contingency basis ranging from 25% to 40% of the net recovery (after deduction of expenses)  
Legal Service Agreement-Blank Rome [Member]    
Legal Fees payment ,Terms Legal fees to Blank Rome LLP equal to 25% of the royalty revenue received by the Company from its license agreement with D-Link  
Legal fees and expenses $ 13,000us-gaap_LegalFees
/ us-gaap_LitigationStatusAxis
= nssi_LegalServiceAgreementWithBlankRomeMember
$ 14,000us-gaap_LegalFees
/ us-gaap_LitigationStatusAxis
= nssi_LegalServiceAgreementWithBlankRomeMember
Legal Service Agreement With Dovel And Luner For Litigation Settlement In July 2010 [Member]    
Legal Fees payment ,Terms Legal fees of a maximum aggregate cash payment of $1.5 million plus a contingency fee of 24% (based on the settlement being achieved at the trial stage)  
Legal fees and expenses 1,187,000us-gaap_LegalFees
/ us-gaap_LitigationStatusAxis
= nssi_LegalServiceAgreementWithDovelAndLunerForLitigationSettlementFiledInJuly2010Member
1,014,000us-gaap_LegalFees
/ us-gaap_LitigationStatusAxis
= nssi_LegalServiceAgreementWithDovelAndLunerForLitigationSettlementFiledInJuly2010Member
Legal Service Agreement With Dovel And Luner For Litigation Filed In September 2011 [Member]    
Legal Fees payment ,Terms Legal fees on a full contingency basis ranging from 12.5% to 35% (with certain exceptions) of the net recovery (after deduction for expenses)  
Legal fees and expenses $ 208,000us-gaap_LegalFees
/ us-gaap_LitigationStatusAxis
= nssi_LegalServiceAgreementWithDovelAndLunerForLitigationFiledInSeptember2011Member
$ 34,000us-gaap_LegalFees
/ us-gaap_LitigationStatusAxis
= nssi_LegalServiceAgreementWithDovelAndLunerForLitigationFiledInSeptember2011Member