Stock Option Plans - Summary of Company's Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 01, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding, beginning shares	1,406
Granted, shares	828
Exercised, shares	0
Forfeited, shares	(15)
Expired, shares	(261)
Outstanding, ending shares	1,958	1,406
Exercisable, shares	1,196
Vested and expected to vest, shares	1,900
Weighted Average Exercise Price, Outstanding beginning	$ 12.85
Weighted Average Exercise Price, Granted	4.03
Weighted Average Exercise Price, Exercised	0
Weighted Average Exercise Price, Forfeited	5.00
Weighted Average Exercise Price, Expired	10.19
Weighted Average Exercise Price, Outstanding ending	9.54	$ 12.85
Weighted Average Exercise Price, Exercisable	10.03
Weighted Average Exercise Price, Vested and expected to vest	$ 8.14
Weighted Average Remaining Contractual Term, outstanding	6 years 3 months 22 days		4 years 3 months 26 days
Weighted Average Remaining Contractual Term, exercisable	4 years 4 months 10 days
Weighted Average Remaining Contractual Term, Vested and expected to vest	6 years 3 months 4 days
Aggregate Intrinsic Value, Outstanding		$ 200
Aggregate Intrinsic Value, Exercisable	$ 0
Aggregate Intrinsic Value, Vested and expected to vest	$ 0