CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income (loss)	$ (9,354)	$ 688
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	299	275
Amortization of definite-lived intangible assets	104	156
Capitalized software amortization	478	368
Amortization of deferred financing costs	6	6
Change in fair value of contingent consideration	173	143
Stock-based compensation expense	438	447
Equity (gain) loss on investment in GSE-UNIS Simulation Technology Co. Ltd.	96	(134)
(Gain) loss on derivative instruments	143	(16)
Changes in assets and liabilities:
Contract receivables	2,786	(5,865)
Prepaid expenses and other assets	215	1,323
Accounts payable, accrued compensation and accrued expenses	(562)	(204)
Billings in excess of revenue earned	716	(838)
Accrued warranty reserves	(329)	163
Other liabilities	(86)	(303)
Net cash provided by (used in) operating activities	1,759	(3,791)
Cash flows from investing activities:
Capital expenditures	(142)	(779)
Capitalized software development costs	(995)	(608)
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	315
Net cash used in investing activities	(1,365)	(3,275)
Cash flows from financing activities:
Proceeds from issuance of common stock	44	221
Payments of the liability-classified contingent consideration arrangements	(1,188)	(806)
Treasury stock purchases	(368)	(303)
Net cash used in financing activities	(1,512)	(888)
Effect of exchange rate changes on cash	(177)	(106)
Net decrease in cash and cash equivalents	(1,295)	(8,060)
Cash and cash equivalents at beginning of year	22,386	20,326
Cash and cash equivalents at end of period	$ 21,091	$ 12,266