Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Data (Unaudited) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net revenues:	$ 14,963	$ 22,906	$ 19,545	$ 25,732	$ 23,647	$ 20,275	$ 20,895	$ 27,291	$ 83,146	$ 92,108	$ 104,685
Gross profit:	1,767	7,007	3,237	11,243	8,165	4,953	4,300	14,597	23,254	32,015	37,413
Income (loss) before income taxes:	(10,669)	(340)	(4,023)	4,846	2,179	(3,106)	(966)	7,919	(10,186)	6,026	13,524
Incomes taxes (benefit):	(1,484)	57	(676)	1,109	397	(478)	(273)	1,612	(994)	1,258	(3,527)
Net income (loss):	$ (9,185)	$ (397)	$ (3,347)	$ 3,737	$ 1,782	$ (2,628)	$ (693)	$ 6,307	$ (9,192)	$ 4,768	$ 17,051
Income per common share-basic:	$ (0.76)	$ (0.03)	$ (0.26)	$ 0.29	$ 0.14	$ (0.21)	$ (0.05)	$ 0.49	$ (0.74)	$ 0.37	$ 1.34
Income per common share-diluted:	$ (0.76)	$ (0.03)	$ (0.26)	$ 0.29	$ 0.14	$ (0.21)	$ (0.05)	$ 0.48	$ (0.74)	$ 0.36	$ 1.29