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Stockholders' Equity - Additional Information (Details) - USD ($)		9 Months Ended
	Apr. 12, 2018	Sep. 30, 2018	Sep. 30, 2017
Class Of Stock [Line Items]
Stock issued during period shares	5,405,000
Shares issued price per share	$ 37.50
Gross proceeds from issuance of common stock	$ 202,688,000
Net proceeds after underwriting discounts and offering expenses	$ 192,053,000	$ 192,053,000	$ 65,528,000
Over-Allotment Option
Class Of Stock [Line Items]
Stock issued during period shares	705,000

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