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, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net revenues:	$ 12,548	$ 8,057	$ 8,663	$ 11,731	$ 11,442	$ 15,681	$ 7,554	$ 17,142	$ 40,999	$ 51,819	$ 83,146
Gross profit (loss):	(2,669)	(2,137)	(2,242)	(366)	(1,021)	1,723	(2,609)	4,576	(7,414)	2,669	23,254
Loss before income taxes:	(8,546)	(7,558)	(9,091)	(6,144)	(12,163)	(6,559)	(8,645)	(392)	(31,339)	(27,759)	(10,186)
Incomes taxes (benefit):	1,308	(228)	435	299	14,675	(746)	(2,797)	(155)	1,814	10,977	(994)
Net loss:	$ (9,854)	$ (7,330)	$ (9,526)	$ (6,443)	$ (26,838)	$ (5,813)	$ (5,848)	$ (237)	$ (33,153)	$ (38,736)	$ (9,192)
Loss per common share - basic:	$ (0.83)	$ (0.62)	$ (0.80)	$ (0.53)	$ (2.23)	$ (0.48)	$ (0.49)	$ (0.02)	$ (2.79)	$ (3.22)	$ (0.74)
Income per common share - diluted:	$ (0.83)	$ (0.62)	$ (0.80)	$ (0.53)	$ (2.23)	$ (0.48)	$ (0.49)	$ (0.02)	$ (2.79)	$ (3.22)	$ (0.74)