Goodwill and intangible assets (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Less: Accumulated amortization	$ (786)	$ (486)
Intangible assets, net	2,913	2,423
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Finite-Lived Intangible Assets, Gross	7	7
Intangible assets, net	6
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Finite-Lived Intangible Assets, Gross	2,532	2,468
Intangible assets, net	1,960
Software And Website Development [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Finite-Lived Intangible Assets, Gross	950	275
Intangible assets, net	788
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Finite-Lived Intangible Assets, Gross	210	159
Intangible assets, net	$ 159