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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |
Net loss | $ (136,450) | $ (33,915)
Income from discontinued operations, net of tax | 0 | 42,158
Loss from continuing operations, net of tax | (136,450) | (76,073)
Adjustments to reconcile loss from continuing operations to net cash used in operating activities: |  |
Change in fair value of contingent consideration | 2,716 | 0
Depreciation and amortization | 3,412 | 8,465
Amortization of deferred financing costs | 0 | 1,428
Provision for doubtful accounts | 652 | 512
Provision for excess and obsolete inventory | 12,261 | 5,659
Impairment of fixed assets | 30,178 | 0
(Gain) loss on sale of assets | (561) | 1,450
Impairment of goodwill | 11,706 | 0
Impairment of right-of-use assets | 7,434 | 0
Impairment of intangible assets | 32,363 | 0
Stock compensation expense | 3,044 | 4,235
Deferred income tax (benefit) provision | (187) | 18,307
Reduction in tax benefit related to stock-based awards | 0 | 24
Non-cash lease expense | 356 | 740
Changes in current assets and liabilities: |  |
Accounts receivable, net | 3,556 | 20,993
Inventories | 3,955 | (727)
Income taxes receivable | 182 | 2,546
Other current assets | 1,026 | 2,579
Other long-term assets | (16) | 3,286
Accounts payable | (12,323) | 1,131
Accrued liabilities | (11,260) | 908
Income taxes payable | 84 | 0
Interest payable | 34 | (8)
Net cash used in operating activities | (47,838) | (4,545)
Cash flows from investing activities: |  |
Capital expenditures | (1,425) | (2,411)
Proceeds from sale of businesses | 9,907 | 155,498
Proceeds from sale of assets | 109 | 240
Purchase of business, net of cash acquired | (26,284) | 0
Purchase of patents and other intangible assets | (8) | (614)
Net cash (used in) provided by investing activities | (17,701) | 152,713
Cash flows from financing activities: |  |
Borrowings on revolving credit facility | 0 | 42,984
Repayments on revolving credit facility | 0 | (92,715)
Payment for contingent consideration | (1,200) | 0
Proceeds from Paycheck Protection Program loan | 4,788 | 0
Payments for finance leases | (70) | (51)
Purchase of treasury stock | (253) | (247)
Proceeds from sale of common stock | 462 | 35
Net cash provided by (used in) financing activities | 3,727 | (49,994)
Discontinued operations: |  |
Net cash used in operating activities | 0 | (322)
Net cash provided by investing activities | 0 | 337
Net cash flows provided by discontinued operations | 0 | 15
Effect of changes in exchange rates on cash and cash equivalents | (102) | 5
Net change in cash, cash equivalents and restricted cash | (61,914) | 98,194
Cash, cash equivalents at beginning of period | 100,575 | 3,044
Restricted cash at the beginning of the period | 663 | 663
Restricted cash at the beginning of the period | 101,238 | 3,707
Cash and cash equivalents at end of period | 38,660 | 100,575
Restricted cash at the end of period | 664 | 663
Cash, cash equivalents and restricted cash at end of period | $ 39,324 | $ 101,238

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