Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018	[1]
Allowance for doubtful accounts	$ 461	$ 345
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	121,412,763	117,246,735
Common stock, shares outstanding	121,412,763	117,246,735
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	22,731,725	24,822,661
Common stock, shares outstanding	22,731,725	24,822,661

[1] See note 1 of the notes to the condensed consolidated financial statements for a summary of adjustments.