Accrued expenses and other liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accrued expenses and other liabilities
Revenue share	$ 4,320	$ 5,683
Salaries and wages	3,284	2,389
Accrued for construction-in-progress	25,467	9,438
Accrued partner network	1,501	1,105
Settlement liabilities	338	1,850
Accrued professional fees	1,075	1,241
Accrued taxes	770	327
Deferred rent	20	18
Holdback liabilities	1,600	1,615
Contingent consideration		131
Other	3,962	2,312
Total accrued expenses and other liabilities	$ 42,337	$ 26,109