Segment Reporting - Reconciliation of Operating Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Segment Reporting Information [Line Items]
Consolidated operating income	$ (19,708)	$ (31,290)	$ (26,760)
Operating Segments | Marine Technology Products
Segment Reporting Information [Line Items]
Consolidated operating income	(2,572)	(508)	279
Operating Segments | Equipment Leasing
Segment Reporting Information [Line Items]
Consolidated operating income	(13,930)	(27,782)	(23,454)
Eliminations
Segment Reporting Information [Line Items]
Consolidated operating income	5	1	117
Corporate expenses
Segment Reporting Information [Line Items]
Consolidated operating income	$ (3,211)	$ (3,001)	$ (3,702)