Goodwill and intangible assets (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Less: Accumulated amortization	$ (603)	$ (486)
Intangible assets, net	2,306	2,423
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 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	2,468	2,468
Intangible assets, net	1,981
Software And Website Development [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Finite-Lived Intangible Assets, Gross	275	275
Intangible assets, net	195
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Finite-Lived Intangible Assets, Gross	159	159
Intangible assets, net	$ 124