Goodwill and Intangible Assets - Intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Intangible Assets
Gross Value	$ 30,805		$ 30,805		$ 30,805
Accumulated Amortization	(7,405)		(7,405)		(5,508)
Intangible Assets, net	23,400		23,400		$ 25,297
Amortization expense	947	$ 577	$ 1,897	$ 1,153
Trade names
Intangible Assets
Weighted Average Amortization Period			5 years		5 years
Gross Value	1,940		$ 1,940		$ 1,940
Accumulated Amortization	(987)		(987)		(791)
Intangible Assets, net	953		$ 953		$ 1,149
Client relationships
Intangible Assets
Weighted Average Amortization Period			10 years 7 days		10 years 7 days
Gross Value	14,684		$ 14,684		$ 14,684
Accumulated Amortization	(4,029)		(4,029)		(3,289)
Intangible Assets, net	10,655		$ 10,655		$ 11,395
Non-competition agreements
Intangible Assets
Weighted Average Amortization Period			4 years 7 months 21 days		4 years 7 months 21 days
Gross Value	652		$ 652		$ 652
Accumulated Amortization	(394)		(394)		(326)
Intangible Assets, net	258		$ 258		$ 326
Developed technology
Intangible Assets
Weighted Average Amortization Period			7 years 9 months 4 days		7 years 9 months 4 days
Gross Value	13,500		$ 13,500		$ 13,500
Accumulated Amortization	(1,992)		(1,992)		(1,101)
Intangible Assets, net	11,508		$ 11,508		$ 12,399
Domain name
Intangible Assets
Weighted Average Amortization Period			10 years		10 years
Gross Value	29		$ 29		$ 29
Accumulated Amortization	(3)		(3)		(1)
Intangible Assets, net	$ 26		$ 26		$ 28