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Summary of Significant Accounting Policies (Details)
Mar. 31, 2015
Dec. 31, 2014
Summary Of Significant Accounting Policies Details    
Convertible preferred stock 5,156,841us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion 16,773,275us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
Warrants to purchase common stock 769,803spex_IncrementalCommonSharesWarrantsUnitPurchaseAgreements 775,021spex_IncrementalCommonSharesWarrantsUnitPurchaseAgreements
Non-vested restricted stock awards    10,000spex_NonvestedPotentiallyDilutedRestrictedStockAwards
Options to purchase common stock 5,298,877spex_OptionsToPurchaseCommonStock 3,323,876spex_OptionsToPurchaseCommonStock
Total 11,225,521spex_PotentiallyDiluted 20,882,172spex_PotentiallyDiluted