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, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net revenues:	$ 13,257	$ 10,663	$ 8,898	$ 9,857	$ 12,328	$ 14,651	$ 8,350	$ 7,613	$ 42,675	$ 42,942	$ 48,276
Gross profit:	5,947	4,051	2,882	3,741	3,411	5,224	1,860	1,245	16,621	11,740	6,084
Loss before income taxes:	(2,993)	(1,968)	(3,088)	(2,360)	(4,176)	(5,440)	(4,504)	(5,468)	(10,409)	(19,588)	(20,159)
Incomes taxes (benefit):	715	60	48	55	(21)	(249)	85	437	878	252	910
Net loss:	$ (3,708)	$ (2,028)	$ (3,136)	$ (2,415)	$ (4,155)	$ (5,191)	$ (4,589)	$ (5,905)	$ (11,287)	$ (19,840)	$ (21,069)
Loss per common share – basic (in usd per share)	$ (0.35)	$ (0.21)	$ (0.30)	$ (0.24)	$ (0.38)	$ (0.47)	$ (0.41)	$ (0.52)	$ (1.10)	$ (1.78)	$ (1.82)
Loss per common share – diluted (in usd per share)	$ (0.35)	$ (0.21)	$ (0.30)	$ (0.24)	$ (0.38)	$ (0.47)	$ (0.41)	$ (0.52)	$ (1.10)	$ (1.78)	$ (1.82)