Goodwill and Intangible Assets - Intangible assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Intangible Assets
Gross Value	$ 30,805		$ 30,805
Accumulated Amortization	(6,458)		(5,508)
Intangible Assets, net	24,347		$ 25,297
Amortization expense	$ 950	$ 576
Trade names
Intangible Assets
Weighted Average Amortization Period	5 years		5 years
Gross Value	$ 1,940		$ 1,940
Accumulated Amortization	(890)		(791)
Intangible Assets, net	$ 1,050		$ 1,149
Client relationships
Intangible Assets
Weighted Average Amortization Period	10 years 7 days		10 years 7 days
Gross Value	$ 14,684		$ 14,684
Accumulated Amortization	(3,659)		(3,289)
Intangible Assets, net	$ 11,025		$ 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
Accumulated Amortization	(360)		(326)
Intangible Assets, net	$ 292		$ 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
Accumulated Amortization	(1,547)		(1,101)
Intangible Assets, net	$ 11,953		$ 12,399
Domain name
Intangible Assets
Weighted Average Amortization Period	10 years		10 years
Gross Value	$ 29		$ 29
Accumulated Amortization	(2)		(1)
Intangible Assets, net	$ 27		$ 28