Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (1,132)	$ (4,807)	$ (19,157)
Other comprehensive loss:
Foreign currency translation adjustments	(71)	(43)	(466)
Comprehensive loss	$ (1,203)	$ (4,850)	$ (19,623)