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Goodwill and Intangible Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
December 31, 2015 $ 7,403us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
December 31, 2016 9,851us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
December 31, 2017 9,825us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
December 31, 2018 9,825us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
December 31, 2019 9,825us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 5,853us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total 52,582us-gaap_FiniteLivedIntangibleAssetsNet 55,004us-gaap_FiniteLivedIntangibleAssetsNet
7/24/13 - Rockstar Patent Portfolio Acquired [Member]    
December 31, 2015 354us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentPortfolioAcquiredMember
 
December 31, 2016 471us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentPortfolioAcquiredMember
 
December 31, 2017 470us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentPortfolioAcquiredMember
 
December 31, 2018 470us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentPortfolioAcquiredMember
 
December 31, 2019 470us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentPortfolioAcquiredMember
 
Thereafter 971us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentPortfolioAcquiredMember
 
Total 3,206us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentPortfolioAcquiredMember
 
9/10/13 - North South patent portfolio Acquired [Member]    
December 31, 2015 98us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_NorthSouthPatentPortfolioAcquiredMember
 
December 31, 2016 130us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_NorthSouthPatentPortfolioAcquiredMember
 
December 31, 2017 130us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_NorthSouthPatentPortfolioAcquiredMember
 
December 31, 2018 130us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_NorthSouthPatentPortfolioAcquiredMember
 
December 31, 2019 130us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_NorthSouthPatentPortfolioAcquiredMember
 
Thereafter 282us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_NorthSouthPatentPortfolioAcquiredMember
 
Total 900us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_NorthSouthPatentPortfolioAcquiredMember
 
12/31/13 - Rockstar Patent Portfolio Acquired [Member]    
December 31, 2015 6,951us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentAcquiredMember
 
December 31, 2016 9,250us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentAcquiredMember
 
December 31, 2017 9,225us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentAcquiredMember
 
December 31, 2018 9,225us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentAcquiredMember
 
December 31, 2019 9,225us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentAcquiredMember
 
Thereafter 4,600us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentAcquiredMember
 
Total $ 48,476us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= spex_RockstarPatentAcquiredMember