Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Allowance for doubtful accounts	$ 659	$ 542
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	103,789,544	87,359,026
Common stock, shares outstanding	103,789,544	87,359,026
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	34,097,075	46,186,159
Common stock, shares outstanding	34,097,075	46,186,159