CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ (10,349)	$ 1,504
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Goodwill impairment loss	4,462	0
Write-down of capitalized software development costs	2,174	0
Depreciation	434	406
Amortization of definite-lived intangible assets	155	235
Capitalized software amortization	509	536
Amortization of deferred financing costs	9	9
Change in fair value of contingent consideration	215	245
Stock-based compensation expense	641	678
Equity (gain) loss on investment in GSE-UNIS Simulation Technology Co. Ltd.	148	(27)
(Gain) loss on derivative instruments	221	(36)
Changes in assets and liabilities:
Contract receivables	3,068	884
Prepaid expenses and other assets	(744)	262
Accounts payable, accrued compensation and accrued expenses	(1,425)	609
Billings in excess of revenue earned	(186)	(225)
Accrued warranty reserves	(266)	(143)
Other liabilities	263	97
Net cash provided by (used in) operating activities	(671)	5,034
Cash flows from investing activities:
Capital expenditures	(287)	(1,404)
Capitalized software development costs	(1,162)	(914)
Investment in GSE-UNIS Simulation Technology Co. Ltd.	0	(469)
Restrictions of cash as collateral under letters of credit	(228)	(1,734)
Releases of cash as collateral under letters of credit	0	1,197
Net cash used in investing activities	(1,677)	(3,324)
Cash flows from financing activities:
Proceeds from issuance of common stock	44	273
Payments of the liability-classified contingent consideration arrangements	(1,890)	(845)
Treasury stock purchases	(651)	(422)
Net cash used in financing activities	(2,497)	(994)
Effect of exchange rate changes on cash	18	262
Net increase (decrease) in cash and cash equivalents	(4,827)	978
Cash and cash equivalents at beginning of year	22,386	20,326
Cash and cash equivalents at end of period	$ 17,559	$ 21,304