Assets Held for Sale and Discontinued Operations - Schedule of Discontinued Operations, Balance Sheet (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Current assets of discontinued operations:
Total current assets of discontinued operations	$ 5,440	$ 14,913
Current liabilities of discontinued operations:
Total current liabilities of discontinued operations	1,133	2,730
Discontinued Operations, Held-for-sale
Current assets of discontinued operations:
Accounts receivable, net	1,963	5,699
Inventories, net	359	605
Prepaid expenses and other current assets	141	227
Seismic equipment lease pool and property and equipment, net	2,977	8,382
Total current assets of discontinued operations	5,440	14,913
Current liabilities of discontinued operations:
Accounts payable	71	884
Deferred revenue	18	34
Accrued expenses and other current liabilities	1,044	1,886
Income taxes payable	0	(74)
Total current liabilities of discontinued operations	$ 1,133	$ 2,730