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Intangible Assets (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Intangible Assets [Abstract]      
Total intangible assets, including those subject to execution of agreement $ 3,665,000us-gaap_FiniteLivedIntangibleAssetsGross $ 3,665,000us-gaap_FiniteLivedIntangibleAssetsGross  
Accumulated amortization 2,285,347us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 1,985,514us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Amortization of intangible assets 299,833us-gaap_AmortizationOfIntangibleAssets 299,833us-gaap_AmortizationOfIntangibleAssets 299,833us-gaap_AmortizationOfIntangibleAssets
Future Amortization Expense, Through July 2018 299,833stxs_FutureAmortizationExpenseThroughJuly2018    
Future Amortization Expense, August 2018 Through May 2020 $ 166,500stxs_FutureAmortizationExpenseAugust2018ThroughMay2020