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Summary of significant accounting policies (Details 2) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($) item	Dec. 31, 2013 USD ($) item
Marketable securities
Short-term marketable securities	$ 0	$ 1,614
Unrealized gains or losses in accumulated other comprehensive loss	0	0
Business combinations
Transaction costs associated with business combinations	$ 0	$ 0	$ 354
Total Revenue \| Customer \| Customer Group
Concentrations of credit risk
Concentration risk percentage	17.00%	15.00%
Number of customer group \| item	1	1	2
Total Revenue \| Customer \| Customer Group One
Concentrations of credit risk
Concentration risk percentage			14.00%
Total Revenue \| Customer \| Customer Group Two
Concentrations of credit risk
Concentration risk percentage			14.00%
Total accounts receivable \| Customer \| Customer Group
Concentrations of credit risk
Number of customer group \| item	4	2
Total accounts receivable \| Customer \| Customer Group One
Concentrations of credit risk
Concentration risk percentage	28.00%	30.00%
Total accounts receivable \| Customer \| Customer Group Two
Concentrations of credit risk
Concentration risk percentage	19.00%	17.00%
Total accounts receivable \| Customer \| Customer Group Three
Concentrations of credit risk
Concentration risk percentage	19.00%
Total accounts receivable \| Customer \| Customer Group Four
Concentrations of credit risk
Concentration risk percentage	10.00%