Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Data (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Net revenues:	$ 11,442	$ 15,681	$ 7,554	$ 17,142	$ 14,963	$ 22,906	$ 19,545	$ 25,732	$ 51,819	$ 83,146	$ 92,108
Gross profit (loss):	(1,021)	1,723	(2,609)	4,576	1,767	7,007	3,237	11,243	2,669	23,254	32,015
(Loss) income before income taxes:	(12,163)	(6,559)	(8,645)	(392)	(10,669)	(340)	(4,023)	4,846	(27,759)	(10,186)	6,026
Incomes taxes (benefit):	14,675	(746)	(2,797)	(155)	(1,484)	57	(676)	1,109	10,977	(994)	1,258
Net (loss) income:	$ (26,838)	$ (5,813)	$ (5,848)	$ (237)	$ (9,185)	$ (397)	$ (3,347)	$ 3,737	$ (38,736)	$ (9,192)	$ 4,768
(Loss) income per common share - basic:	$ (2.23)	$ (0.48)	$ (0.49)	$ (0.02)	$ (0.76)	$ (0.03)	$ (0.26)	$ 0.29	$ (3.22)	$ (0.74)	$ 0.37
Income per common share - diluted:	$ (2.23)	$ (0.48)	$ (0.49)	$ (0.02)	$ (0.76)	$ (0.03)	$ (0.26)	$ 0.29	$ (3.22)	$ (0.74)	$ 0.36