Assets Held for Sale and Discontinued Operations - Schedule of Discontinued Operations, Balance Sheet (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jan. 31, 2021
Current assets of discontinued operations:
Total assets of discontinued operations	$ 3,312	$ 4,321
Current liabilities of discontinued operations:
Total liabilities of discontinued operations	705	963
Discontinued Operations, Held-for-sale
Current assets of discontinued operations:
Accounts receivable, net	1,151	1,668
Inventories, net	68	352
Prepaid expenses and other current assets	120	150
Seismic equipment lease pool and property and equipment, net	1,973	2,151
Total assets of discontinued operations	3,312	4,321
Current liabilities of discontinued operations:
Accounts payable	21	59
Deferred revenue	73	73
Accrued expenses and other current liabilities	611	831
Total liabilities of discontinued operations	$ 705	$ 963