Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 10,836	$ 8,663	$ 29,269	$ 20,394
Operating income (loss)	(4,972)	(8,315)	(7,261)	(14,646)
Income (loss) before taxes	(5,007)	(9,091)	(7,443)	(15,235)
Operating Segments [Member] | Equipment Manufacturing and Sales [Member]
Segment Reporting Information [Line Items]
Revenues	9,662	5,758	16,573	12,978
Operating income (loss)	850	(421)	1,234	(219)
Income (loss) before taxes	882	(734)	995	(1,186)
Operating Segments [Member] | Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Revenues	1,271	2,909	12,816	7,452
Operating income (loss)	(4,988)	(7,077)	(6,644)	(12,746)
Income (loss) before taxes	(5,041)	(7,552)	(6,561)	(12,335)
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(97)	(4)	(120)	(36)
Operating income (loss)		15		21
Income (loss) before taxes	(14)	27	(26)	(12)
Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(834)	(832)	(1,851)	(1,702)
Income (loss) before taxes	$ (834)	$ (832)	$ (1,851)	$ (1,702)