Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2019	Jan. 31, 2019
Allowance for doubtful accounts	$ 321	$ 468
Class A common stock [Member]
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	800,000,000	800,000,000
Common stock, shares issued	127,826,549	125,980,019
Common stock, shares outstanding	127,826,549	125,980,019
Class B common stock [Member]
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	190,000,000	190,000,000
Common stock, shares issued	19,203,915	20,210,060
Common stock, shares outstanding	19,203,915	20,210,060