Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 30, 2015	Jan. 31, 2015
Allowance for doubtful accounts	$ 404	$ 413
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	71,381,462	64,729,479
Common stock, shares outstanding	71,381,462	64,729,479
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	60,255,819	66,338,146
Common stock, shares outstanding	60,255,819	66,338,146