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Capitalization - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended
	Sep. 30, 2019	Aug. 31, 2019	Jan. 31, 2019	Sep. 30, 2019
Warrants
Sale of Stock, Number of Shares Issued in Transaction	2,475,248		7,563,725	63,926
Sale of Stock, Price Per Share	$ 46.60		$ 30.20	$ 46.60
Sale of Stock, Consideration Received on Transaction	$ 97.0		$ 224.2	$ 2.6
Over-Allotment Option
Warrants
Sale of Stock, Number of Shares Issued in Transaction	371,287		843,725
Maximum
Warrants
Sale of Stock, Consideration Received on Transaction		$ 125.0
Common stock
Warrants
Sale of Stock, Price Per Share	$ 40.40			$ 40.40

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