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Capitalization (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	Apr. 08, 2018	Jun. 30, 2018	Jun. 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	$ 117,874	$ 0
Over-Allotment Option
Warrants
Stock issued (in shares)	600,000
Warrants | Common stock | 2019
Warrants
Warrant shares (in shares)		7,030
Exercise price (in dollars per share)		$ 128.00
Warrants | Common stock | 2019
Warrants
Warrant shares (in shares)		130
Exercise price (in dollars per share)		$ 2,520.00

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