Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Nov. 30, 2017	Oct. 31, 2017
Common Stock
Subsequent Event [Line Items]
Stock newly-issued during the period (in shares)		11,280
Subsequent Event | Director
Subsequent Event [Line Items]
Proceeds from warrant exercises	$ 450
Subsequent Event | Warrant | Director
Subsequent Event [Line Items]
Exercise price of warrants (in dollars per share)	$ 15.00
Subsequent Event | Common Stock | Director
Subsequent Event [Line Items]
Stock newly-issued during the period (in shares)	30,000