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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Cash flows from operating activities: |  |  |  |
Net loss | $ (6,644) | $ (13,246) | $ (20,306) | $ (11,287)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |  |
PPP loan forgiveness | (850) | 0 | (757) | 0
Depreciation and amortization | 1,226 | 3,210 | 4,627 | 7,768
Stock-based compensation | 236 | 449 | 708 | 854
Impairment of intangible assets | 0 | 2,531 | 2,531 | 760
Loss on disposal of discontinued operations | 0 | 1,859 | 1,859 | 0
(Recovery) provision for doubtful accounts, net of charge offs | (453) | 470 | 1,129 | 2,000
Provision for inventory obsolescence | 350 | 234 | 321 | 298
Gross profit from sale of lease pool equipment | 0 | (1,326) | (1,326) | (1,197)
Gross profit from sale of other equipment | (155) | 0 | (357) | 0
Deferred tax expense | 0 | 263 | 32 | 503
Non-current prepaid tax |  |  | 0 | 50
Changes in: |  |  |  |
Accounts receivable | (140) | 4,404 | 4,632 | (1,723)
Unbilled revenue | 21 | (9) | 72 | (327)
Inventories | (542) | (675) | 1,178 | (2,810)
Prepaid expenses and other current and long-term assets | (260) | 766 | 581 | (506)
Income taxes receivable and payable | (63) | 0 | 767 | 0
Accounts payable, accrued expenses and other current liabilities | 375 | (1,583) | (2,510) | (178)
Deferred revenue | (292) | 87 | 459 | (335)
Foreign exchange losses net of gains |  |  | 0 | 313
Net cash used in operating activities | (7,191) | (2,566) | (6,360) | (5,817)
Cash flows from investing activities: |  |  |  |
Purchases of seismic equipment held for lease | 0 | (110) | (110) | (2,955)
Purchase of technology |  |  | (366) | 0
Purchases of property and equipment | (14) | (302) | (90) | (1,036)
Sale of used lease pool equipment | 0 | 2,010 | 2,010 | 1,664
Sale of assets held for sale | 484 | 0 | 1,506 | 0
Sale of a business | 761 | 0 | 257 | 239
Net cash provided by investing activities | 1,231 | 1,598 | 3,207 | (2,088)
Cash flows from financing activities: |  |  |  |
Purchase of treasury stock | 2 | 0 |  |
Net proceeds from preferred stock offering | 4,502 | 0 | 1,000 | 3,773
Net proceeds from common stock offering | 43 | 0 | 3,584 | 0
Preferred stock dividends | (1,160) | (1,118) | (1,677) | (2,050)
Proceeds from PPP loans | 0 | 1,607 | 1,607 | 0
Proceeds from exercise of stock options |  |  | 0 | 26
Net cash provided by financing activities | 3,383 | 489 | 4,514 | 1,749
Effect of changes in foreign exchange rates on cash, cash equivalents and restricted cash | 22 | (117) | 16 | (159)
Net increase (decrease) in cash, cash equivalents and restricted cash | (2,555) | (596) | 1,377 | (6,315)
Cash, cash equivalents and restricted cash, beginning of period | 4,611 | 3,234 | 3,234 | 9,549
Cash, cash equivalents and restricted cash, end of period | 2,056 | 2,638 | 4,611 | 3,234
Supplemental cash flow information: |  |  |  |
Interest paid | 18 | 23 | $ 40 | $ 63
Income taxes paid | $ 147 | $ 246 |  |

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