Accrued expenses and other liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accrued expenses and other liabilities
Accrued construction in progress	$ 20,930	$ 12,661
Accrued customer liabilities	15,219	7,100
Revenue share	5,514	5,506
Salaries and wages	4,425	5,066
Accrued taxes	2,745	1,897
Holdback consideration	2,000	0
Acquisition purchase consideration	1,952	0
Accrued professional fees	1,434	1,979
Accrued partner network	1,228	1,799
Other	7,206	6,397
Total accrued expenses and other liabilities	$ 62,653	$ 42,405