Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 8,644	$ 8,057	$ 37,913	$ 28,451
Operating income (loss)	(4,793)	(7,734)	(12,054)	(22,380)
Income (loss) before taxes	(4,695)	(7,558)	(12,138)	(22,793)
Operating Segments [Member] | Equipment Manufacturing and Sales [Member]
Segment Reporting Information [Line Items]
Revenues	5,992	5,251	22,565	18,229
Operating income (loss)	(74)	(647)	1,160	(867)
Income (loss) before taxes	4	(513)	999	(1,699)
Operating Segments [Member] | Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Revenues	2,730	2,806	15,546	10,258
Operating income (loss)	(3,927)	(6,341)	(10,571)	(19,087)
Income (loss) before taxes	(3,933)	(6,292)	(10,494)	(18,627)
Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Operating income (loss)	(792)	(688)	(2,643)	(2,390)
Income (loss) before taxes	(792)	(688)	(2,643)	(2,390)
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(78)	0	(198)	(36)
Operating income (loss)	0	(58)	0	(36)
Income (loss) before taxes	$ 26	$ (65)	$ 0	$ (77)