Goodwill and intangible assets (Details 1) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Less: Accumulated amortization	$ (362)	$ (118)
Intangible assets, net	2,488	1,795
Intellectual Property [Member]
Estimated Useful Life	9 years
Finite-Lived Intangible Assets, Gross	2,410	1,913
Software And Website Development [Member]
Estimated Useful Life	3 years
Finite-Lived Intangible Assets, Gross	275	0
Customer Lists [Member]
Estimated Useful Life	5 years
Finite-Lived Intangible Assets, Gross	159	0
Trademarks [Member]
Estimated Useful Life	1 year 6 months
Finite-Lived Intangible Assets, Gross	$ 6	$ 0