Assets Held for Sale and Discontinued Operations - Schedule of Discontinued Operations, Balance Sheet (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Jan. 31, 2020
Current assets of discontinued operations:
Total current assets of discontinued operations	$ 6,650	$ 14,913
Current liabilities of discontinued operations:
Total current liabilities of discontinued operations	1,305	2,730
Discontinued Operations, Held-for-sale
Current assets of discontinued operations:
Accounts receivable, net	2,366	5,699
Inventories, net	388	605
Prepaid expenses and other current assets	221	227
Seismic equipment lease pool and property and equipment, net	3,675	8,382
Total current assets of discontinued operations	6,650	14,913
Current liabilities of discontinued operations:
Accounts payable	119	884
Deferred revenue	0	34
Accrued expenses and other current liabilities	1,186	1,886
Income taxes payable	0	(74)
Total current liabilities of discontinued operations	$ 1,305	$ 2,730