Goodwill and intangible assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill
Goodwill, gross, at the Beginning of the period	$ 347,599
Acquisition of BPS		335,791
Impact of change in Euro exchange rate	14,464	11,808
Goodwill, net, at the end of the period	362,063	347,599
Intangible assets
Gross book value	4,983,242	4,679,552
Accumulated amortization	(2,162,333)	(1,389,962)
Net book value	2,820,909	3,289,590
Amortization period	5 years
Amortization expense	735,265	569,721	224,486
Trademarks and patents
Intangible assets
Gross book value	1,100,696	917,456
Accumulated amortization	(327,200)	(258,325)
Net book value	773,496	659,131
Amortization period	15 years
Technology
Intangible assets
Gross book value	3,015,192	2,894,742
Accumulated amortization	(967,779)	(351,018)
Net book value	2,047,413	2,543,724
Amortization period	5 years
Customer contracts
Intangible assets
Gross book value	867,354	867,354
Accumulated amortization	(867,354)	(780,619)
Net book value		$ 86,735
Amortization period	5 years