CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2019	Jan. 31, 2019
Accounts receivable, allowances	$ 5,193	$ 2,071
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	200,000,000	0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	0	158,104,540
Preferred stock, shares issued (in shares)	0	152,665,804
Preferred stock, shares outstanding (in shares)	0	152,665,804
Class A Common Stock
Common stock, shares authorized (in shares)	2,000,000,000	320,000,000
Common stock, shares issued (in shares)	109,311,196	0
Common stock, shares outstanding (in shares)	109,311,196	0
Class B Common Stock
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	166,915,262
Common stock, shares outstanding (in shares)	166,915,262	90,327,435