Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Allowance for doubtful accounts	$ 404	$ 659
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	114,287,488	103,789,544
Common stock, shares outstanding	114,287,488	103,789,544
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	26,122,845	34,097,075
Common stock, shares outstanding	26,122,845	34,097,075