Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Cash flows from operating activities:
Net loss	$ (20,306)	$ (11,287)
Adjustments to reconcile net loss to net cash used in operating activities:
PPP loan forgiveness	(757)	0
Depreciation and amortization	4,627	7,768
Stock-based compensation	708	854
Impairment of intangible assets	2,531	760
Loss on disposal of discontinued operations	1,859	0
Provision for doubtful accounts, net of charge offs	1,129	2,000
Provision for inventory obsolescence	321	298
Gross profit from sale of lease pool equipment	(1,326)	(1,197)
Gross profit from sale of other equipment	(357)	0
Deferred tax expense	32	503
Non-current prepaid tax	0	50
Changes in:
Accounts receivable	4,632	(1,723)
Unbilled revenue	72	(327)
Inventories	1,178	(2,810)
Income taxes receivable and payable	767	0
Accounts payable, accrued expenses and other current liabilities	(2,510)	(178)
Prepaid expenses and other current and long-term assets	581	(506)
Deferred revenue	459	(335)
Foreign exchange losses net of gains	0	313
Net cash used in operating activities	(6,360)	(5,817)
Cash flows from investing activities:
Purchases of seismic equipment held for lease	(110)	(2,955)
Purchase of technology	(366)	0
Purchases of property and equipment	(90)	(1,036)
Sale of used lease pool equipment	2,010	1,664
Sale of assets held for sale	1,506	0
Sale of business, net of cash sold	257	239
Net cash provided by (used in) investing activities	3,207	(2,088)
Cash flows from financing activities:
Net proceeds from preferred stock offering	1,000	3,773
Net proceeds from common stock offering	3,584	0
Preferred stock dividends	(1,677)	(2,050)
Proceeds from PPP loans	1,607	0
Proceeds from exercise of stock options	0	26
Net cash provided by financing activities	4,514	1,749
Effect of changes in foreign exchange rates on cash, cash equivalents and restricted cash	16	(159)
Net increase (decrease) in cash, cash equivalents and restricted cash	1,377	(6,315)
Cash, cash equivalents and restricted cash, beginning of period	3,234	9,549
Cash, cash equivalents and restricted cash, end of period	$ 4,611	$ 3,234