Related Party Transactions (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2006 representative	Oct. 24, 2013 USD ($)
Related Party Transaction [Line Items]
Number of representatives | representative				1
Percentage of outstanding preferred stock purchased	39.30%				39.30%
Pro rata share in revolving credit agreement (up to)					$ 500,000
Vetstreet
Related Party Transaction [Line Items]
Business acquisition, total cost		$ 2,500,000
Percentage of cumulative ownership		19.90%
Payments to acquire business		$ 9,600,000
Akin Gump Strauss Hauer Feld
Related Party Transaction [Line Items]
Business acquisition, total cost	$ 2,500,000	1,500,000	$ 900,000
VetSource
Related Party Transaction [Line Items]
Business acquisition, total cost	7,000,000	$ 6,000,000	$ 5,700,000
Agreement term				5 years
Agreement renewal term				1 year
Agreement termination notice (at least)				120 days
Amount available in revolving credit agreement					$ 1,200,000
Notes receivable, related parties	$ 0