Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Allowance for doubtful accounts	$ 192	$ 617
Class A common stock
Common stock, par value (in usd per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	800,000,000	800,000,000
Common stock, shares issued (in shares)	134,844,536	133,892,725
Common stock, shares outstanding (in shares)	134,844,536	133,892,725
Class B common stock
Common stock, par value (in usd per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	190,000,000	190,000,000
Common stock, shares issued (in shares)	15,185,511	15,202,858
Common stock, shares outstanding (in shares)	15,185,511	15,202,858