Equity-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2016	Jan. 31, 2016
Number of Shares [Roll Forward]
Number of shares, Outstanding at beginning balance	839,715
Number of shares, Granted	134,433
Number of shares, Expired	(10,000)
Number of shares, Forfeited	(27,157)
Number of shares, Outstanding at ending balance	936,991	839,715
Number of shares, Exercisable	771,869	576,871
Weighted Average Exercise Price [Abstract]
Weighted average exercise price, Outstanding at beginning balance	$ 17.61
Weighted average exercise price, Granted	7.04
Weighted average exercise price, Expired	29.29
Weighted average exercise price, Forfeited	23.20
Weighted average exercise price, Outstanding at ending balance	15.81	$ 17.61
Weighted average exercise price, Exercisable	19.00
Weighted average exercise price, Exercisable	$ 16.80	$ 19.00
Weighted Average Contractual Term and Intrinsic Value [Abstract]
Weighted average remaining contractual term, Outstanding	6 years 10 months 24 days	7 years 1 month 6 days
Weighted average remaining contractual term, Exercisable	6 years 8 months 12 days	6 years 6 months
Intrinsic value, Outstanding at ending balance	$ 399
Intrinsic value, Exercisable at ending balance	$ 399