Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019
Allowance for doubtful accounts	$ 524	$ 253
Preferred Stock
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, authorized	100,000,000	0
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common Stock
Common stock, par value	$ 0.001	$ 0.001
Common stock, authorized	1,000,000,000	0
Common stock, issued	126,920,943	0
Common stock, outstanding	126,920,943	0
Convertible Preferred Stock
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, authorized	0	72,622,216
Preferred stock, issued	0	72,482,609
Preferred stock, outstanding	0	72,482,609
Preferred stock, aggregate liquidation preference		$ 276,853
Common Stock, Class A
Common stock, par value	$ 0.001	$ 0.001
Common stock, authorized	0	200,000,000
Common stock, issued	0	29,755,883
Common stock, outstanding	0	29,755,883
Common Stock, Class B
Common stock, par value	$ 0.001	$ 0.001
Common stock, authorized	0	3,000
Common stock, issued	0	3,000
Common stock, outstanding	0	3,000