Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Allowance for doubtful accounts	$ 617	$ 468
Class A common stock
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	800,000,000	800,000,000
Common stock, shares issued	133,892,725	125,980,019
Common stock, shares outstanding	133,892,725	125,980,019
Class B common stock
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	190,000,000	190,000,000
Common stock, shares issued	15,202,858	20,210,060
Common stock, shares outstanding	15,202,858	20,210,060