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, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net revenues:	$ 10,363	$ 8,644	$ 10,836	$ 18,433	$ 12,548	$ 8,057	$ 8,663	$ 11,731	$ 48,276	$ 40,999	$ 51,819
Gross profit (loss):	1,371	901	618	3,194	(2,669)	(2,137)	(2,242)	(366)	6,084	(7,414)	2,669
Loss before income taxes:	(8,021)	(4,695)	(5,007)	(2,436)	(8,546)	(7,558)	(9,091)	(6,144)	(20,159)	(31,339)	(27,759)
Incomes taxes (benefit):	(262)	586	357	229	1,308	(228)	435	299	910	1,814	10,977
Net loss:	$ (7,759)	$ (5,281)	$ (5,364)	$ (2,665)	$ (9,854)	$ (7,330)	$ (9,526)	$ (6,443)	$ (21,069)	$ (33,153)	$ (38,736)
Loss per common share – basic (in usd per share)	$ (0.66)	$ (0.46)	$ (0.46)	$ (0.24)	$ (0.83)	$ (0.62)	$ (0.80)	$ (0.53)	$ (1.82)	$ (2.79)	$ (3.22)
Income per common share – diluted (in usd per share)	$ (0.66)	$ (0.46)	$ (0.46)	$ (0.24)	$ (0.83)	$ (0.62)	$ (0.80)	$ (0.53)	$ (1.82)	$ (2.79)	$ (3.22)