Income Taxes - Reconciliation of Income Taxes by Jurisdiction (Detail) - USD ($) $ 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
Loss before income taxes is attributable to the following jurisdictions:
Domestic									$ (17,685)	$ (11,900)	$ (6,766)
Foreign									(13,654)	(15,859)	(3,420)
Loss before income taxes	$ (8,546)	$ (7,558)	$ (9,091)	$ (6,144)	$ (12,163)	$ (6,559)	$ (8,645)	$ (392)	(31,339)	(27,759)	(10,186)
Current:
Domestic									34	(16)	387
Foreign									846	684	1,687
Total									880	668	2,074
Deferred:
Domestic									40	10,762	(4,230)
Foreign									894	(453)	1,162
Total									934	10,309	(3,068)
Income tax expense (benefit)	$ 1,308	$ (228)	$ 435	$ 299	$ 14,675	$ (746)	$ (2,797)	$ (155)	$ 1,814	$ 10,977	$ (994)