Quarterly report pursuant to Section 13 or 15(d)

Registration Statement on Form S-3 (Details Textual)

Registration Statement on Form S-3 (Details Textual) (USD $)
3 Months Ended
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
Outstanding Common Stock Held by Non Affiliates Aggregate Market Value $ 75,000,000sglb_OutstandingCommonStockHeldByNonAffiliatesAggregateMarketValue