Segment Reporting - Reconciliation of Operating Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Segment Reporting Information [Line Items]
Consolidated operating income	$ (13,020)	$ (19,708)	$ (31,290)
Operating segments | Marine Technology Products
Segment Reporting Information [Line Items]
Consolidated operating income	(3,780)	(2,572)	(508)
Operating segments | Equipment Leasing
Segment Reporting Information [Line Items]
Consolidated operating income	(5,872)	(13,930)	(27,782)
Corporate expenses
Segment Reporting Information [Line Items]
Consolidated operating income	(3,375)	(3,211)	(3,001)
Eliminations
Segment Reporting Information [Line Items]
Consolidated operating income	$ 7	$ 5	$ 1