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Capitalization - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Apr. 08, 2018	Sep. 30, 2018	Sep. 30, 2017
Warrants
Stock issued (in shares)	4,600,000
Share price (in dollars per share)	$ 27.04
Net proceeds from public offerings	$ 117,900	$ 117,915	$ 0
Over-Allotment Option
Warrants
Stock issued (in shares)	600,000

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