Property and Equipment - Schedule of Depreciation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Property and Equipment
Depreciation	$ 1,403	$ 1,743	$ 2,833	$ 4,442
Service costs
Property and Equipment
Depreciation	721	864	1,464	2,328
Sales and marketing
Property and Equipment
Depreciation	9	13	18	26
Product development
Property and Equipment
Depreciation	23	33	46	74
General and administrative
Property and Equipment
Depreciation	$ 650	$ 833	$ 1,305	$ 2,014