Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2017	Oct. 31, 2016
Statement of Financial Position [Abstract]
Convertible preferred stock, shares authorized	10,000,000	10,000,000
Convertible preferred stock, shares issued	3,936,732	7,374,454
Convertible preferred stock, shares outstanding	3,936,732	7,374,454
Convertible preferred stock, liquidation preference	$ 2,585	$ 4,854
Common stock, par value	$ 0.001	$ .001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	5,723,104	2,782,963
Common stock, shares outstanding	5,723,104	2,782,963