Prepaid Expenses and Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 GSE-UNIS Simulation Technology , Ltd. [Member]
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid expenses	$ 630	$ 608
Deferred income taxes - current	13	119
Value added tax receivable	409	128
Unrestricted certificates of deposit	0	846
Receivable from sale of 49% stake in GSE-UNIS	1,183	0	1,183
Other current assets	1,464	1,511
Total	3,699	3,212
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage			49.00%
Disposal Date			Jul. 31, 2013
Receivable from sale of 49% stake in GSE-UNIS	$ 1,183	$ 0	$ 1,183

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