Goodwill and Intangible Asset - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,675,000	$ 2,675,000
Changes in amount of goodwill recognized	0	0
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	$ 5,500,000	$ 5,500,000	$ 5,500,000