Goodwill and Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets, amortization period	20 years
Amortization of intangible assets	$ 549,000	$ 89,000	$ 0