Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Total property and equipment	$ 22,082	$ 17,237
Less accumulated depreciation and amortization	(8,277)	(5,505)
Total	13,805	11,732
Computer and Office Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	3,563	2,717
Purchased Software
Property Plant And Equipment [Line Items]
Total property and equipment	1,119	1,074
Capitalized Software Development Costs
Property Plant And Equipment [Line Items]
Total property and equipment	5,703	3,460
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	2,396	1,890
Leasehold Improvements and Other
Property Plant And Equipment [Line Items]
Total property and equipment	$ 9,301	$ 8,096