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OVER-ALLOTMENT OPTION EXERCISED (Details Textual) (USD $)
1 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended
Oct. 29, 2013
Dec. 31, 2013
Dec. 31, 2014
Oct. 31, 2013
Over Allotment Option Exercised [Line Items]        
Stock Issued During Period Public Offering Shares     6,900,000gdef_StockIssuedDuringPeriodPublicOfferingShares  
Sale of Stock, Price Per Share   $ 0.012us-gaap_SaleOfStockPricePerShare    
Proceeds from Issuance Initial Public Offering $ 73,545,000us-gaap_ProceedsFromIssuanceInitialPublicOffering $ 69,000,000us-gaap_ProceedsFromIssuanceInitialPublicOffering $ 0us-gaap_ProceedsFromIssuanceInitialPublicOffering  
IPO [Member]        
Over Allotment Option Exercised [Line Items]        
Shares Exercised From Over Allotment       900,000gdef_SharesExercisedFromOverAllotment
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Sale of Stock, Price Per Share     $ 10.00us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Proceeds from Issuance Initial Public Offering     $ 69,000,000us-gaap_ProceedsFromIssuanceInitialPublicOffering
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember