Prepaid Expenses and Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2014
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid expenses	630us-gaap_OtherPrepaidExpenseCurrent	539us-gaap_OtherPrepaidExpenseCurrent
Deferred income taxes - current	13	27
Value added tax receivable	409us-gaap_IncomeTaxesReceivable	533us-gaap_IncomeTaxesReceivable
Receivable from sale of 49% stake in GSE-UNIS	1,183us-gaap_OtherReceivables	0us-gaap_OtherReceivables
Other current assets	1,464us-gaap_OtherAssetsCurrent	604us-gaap_OtherAssetsCurrent
Total	3,699	1,703
GSE-UNIS Simulation Technology , Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.00%	49.00%
Disposal Date	Jul. 31, 2013

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences expected to be realized or consumed within one year or operating cycle, if longer.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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