Government Grants (Details)	6 Months Ended			12 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2013 OTF AEP Grant USD ($)	Dec. 31, 2012 OTF AEP Grant USD ($)	Jun. 20, 2011 OTF AEP Grant USD ($)	Jun. 30, 2013 Walloon Region Grant USD ($)	Jun. 30, 2013 Walloon Region Grant EUR (€)	Dec. 31, 2012 Walloon Region Grant USD ($)	Dec. 31, 2012 Walloon Region Grant EUR (€)	Dec. 07, 2007 Walloon Region Grant USD ($) Item	Dec. 07, 2007 Walloon Region Grant EUR (€)
Government Grants
Total grants awarded					$ 1,000,000					$ 3,400,000	€ 2,600,000
Cash received from government grants	1,709,000	947,000	300,000	300,000
Amount received recognized as deduction from the carrying amount of the property, plant and equipment			200,000	200,000		1,500,000	1,200,000	700,000	500,000
Amount received recognized as deduction from research and development expenses			$ 100,000	$ 100,000
Number of grants awarded										2	2