COMMITMENT AND CONTINGENCIES (Details Textual)	6 Months Ended
Jun. 30, 2015
Commitments And Contingencies [Line Items]
Percentage Of Underwriting Discount	3.00%
Underwriter [Member]
Commitments And Contingencies [Line Items]
Deferred Fees Percentage	2.75%

Represents the percentage of underwriting discount paid in cash at the closing of the public offering to underwriters.

No definition available.

Name:	gdef_PercentageOfUnderwritingDiscount
Namespace Prefix:	gdef_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration