Goodwill and intangible assets (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets, Future Amortization Expense [Line Items]
2014	$ 745
2015	745
2016	582
2017	417
2018	384
Thereafter	41
Total	2,913	2,423
Trademarks [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Line Items]
2014	3
2015	3
2016	0
2017	0
2018	0
Thereafter	0
Total	6
Intellectual Property [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Line Items]
2014	384
2015	384
2016	384
2017	384
2018	384
Thereafter	40
Total	1,960
Software And Website Development [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Line Items]
2014	316
2015	316
2016	156
2017	0
2018	0
Thereafter	0
Total	788
Customer Lists [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Line Items]
2014	42
2015	42
2016	42
2017	33
2018	0
Thereafter	0
Total	$ 159