Accrued expenses and other liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accrued expenses and other liabilities
Accrued construction in progress	$ 9,431	$ 6,753
Salaries and wages	4,937	3,001
Revenue share	4,586	5,611
Accrued customer liabilities	4,232	4,651
Accrued professional fees	2,425	1,183
Accrued taxes	2,007	1,761
Accrued partner network	1,143	1,022
Other	6,226	3,741
Total accrued expenses and other liabilities	$ 34,987	$ 27,723