Stock-based Compensation (Details) Expense Category - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 888	$ 743	$ 1,669	$ 1,439
Claims expense
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	89	57	159	115
Other Cost of Revenue
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	60	9	103	17
Sales and marketing
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	198	165	385	247
Technology and development
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	59	36	109	91
General and administrative
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 482	$ 476	$ 913	$ 969