Goodwill and Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	$ 30,932,000		$ 9,676,000
Impairment of goodwill	0		$ 0
Amortization expense for intangible assets	$ 700,000	$ 300,000