Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations-Unaudited - Quarterly Results of Operations (Detail)

v3.7.0.1
Quarterly Results of Operations-Unaudited - Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 23,812 $ 19,961 $ 18,452 $ 21,570 $ 27,197 $ 28,747 $ 27,871 $ 23,177      
Gross profit 15,763 9,812 7,456 9,149 15,419 6,877 14,427 10,116 $ 42,180 $ 46,839 $ 57,107
Operating expenses 40,231 18,247 19,124 18,724 37,561 18,718 19,177 19,582 96,326 95,038 83,560
Net loss $ (27,376) $ (8,082) $ (26,884) $ (8,907) $ (22,280) $ (10,565) $ (5,027) $ (9,825) $ (71,249) $ (47,697) $ (27,484)
Loss per share                      
Basic $ (0.78) $ (0.23) $ (0.77) $ (0.26) $ (0.66) $ (0.31) $ (0.16) $ (0.29) $ (2.04) $ (1.42) $ (0.84)
Diluted $ (0.78) $ (0.23) $ (0.77) $ (0.26) $ (0.66) $ (0.31) $ (0.16) $ (0.29) $ (2.04) $ (1.42) $ (0.84)