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Registration Statement on Form S-3 (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Mar. 31, 2015
Maximum Securities Available for Offering As Per Registration Statement $ 100,000,000sglb_MaximumSecuritiesAvailableForOfferingAsPerRegistrationStatement  
Maximum Amount of Offering Price As Per Registration Statement 25,000,000sglb_MaximumAmountOfOfferingPriceAsPerRegistrationStatement  
Percentage Of Commission On Gross Sales Price Per Share 3.00%sglb_PercentageOfCommissionOnGrossSalesPricePerShare  
Scenario, Forecast [Member]    
Outstanding Common Stock Held by Non Affiliates Aggregate Market Value   $ 75,000,000sglb_OutstandingCommonStockHeldByNonAffiliatesAggregateMarketValue
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember