Stock-Based Compensation - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Employee Stock Option [Member]
Number of Shares, Outstanding at beginning of period	3,525,530	383,210
Number of Shares, Granted	2,638,769	3,482,000
Number of Shares, Exercised	(161,810)	(268,847)
Number of Shares, Forfeited	(217,984)	(70,833)
Number of Shares, Outstanding at end of period	5,784,505	3,525,530
Number of Shares, Options exercisable	3,505,407
Weighted Average Exercise Price, Outstanding at beginning of year	$ 6.34	$ 5.74
Weighted Average Exercise Price, Granted	23.55	6.29
Weighted Average Exercise Price, Exercised	4.31	4.84
Weighted Average Exercise Price, Forfeited	21.89	6.42
Weighted Average Exercise Price, Outstanding at end of year	13.68	$ 6.34
Weighted Average Exercise Price, Options exercisable	8.53
Weighted-average fair value of options granted during the period	$ 17.56
Non-Employee Stock Option [Member]
Number of Shares, Outstanding at beginning of period	293,000
Number of Shares, Granted	3,000	293,000
Number of Shares, Outstanding at end of period	296,000	293,000
Number of Shares, Options exercisable	174,625
Weighted Average Exercise Price, Outstanding at beginning of year	$ 19.61
Weighted Average Exercise Price, Granted	18.63	19.61
Weighted Average Exercise Price, Outstanding at end of year	19.60	$ 19.61
Weighted Average Exercise Price, Options exercisable	$ 17.65