Stockholders' Deficit (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	May 31, 2016	Sep. 30, 2017
Class of Stock [Line Items]
Proceeds from stock issuance		$ 19.4
Underwriting discounts, commissions and other offering costs		$ 0.7
Common Stock
Class of Stock [Line Items]
Aggregate offering price	$ 25.0
Stock issued (in shares)		1,550,880