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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Operating activities |  |
Net loss | $ (64,568) | $ (19,514)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 22,658 | 24,721
Stock-based compensation expense | 9,541 | 9,461
Impairments |  | 7,719
Restructuring and other charges | 22,465 | 34,902
Gain on sale of assets | (3,886) | (538)
Deferred income taxes | (993) | (2,116)
Changes in operating assets and liabilities: |  |
Trade receivables, net | 11,632 | 8,705
Unbilled receivables | 25,961 | (4,815)
Inventories, net | (6,680) | (38,475)
Prepaids and other assets | 14,706 | (23,185)
Accounts payable and accrued expenses | 2,902 | (1,169)
Other, net | 0 | 2
Net cash provided by (used in) operating activities | 33,738 | (4,302)
Investing activities |  |
Purchase of property, plant and equipment | (7,928) | (10,243)
Proceeds from sale of equipment | 5,967 | 3,646
Net cash used in investing activities | (1,961) | (6,597)
Financing activities |  |
Repurchase of common shares | (1,132) | (25,000)
Other | (113) | (176)
Net cash used in financing activities | (1,245) | (25,176)
Effect of exchange rate changes on cash activities | (1,315) | (3,700)
Increase (decrease) in cash and cash equivalents | 29,217 | (39,775)
Cash and cash equivalents at beginning of period | 345,955 | 398,946
Cash and cash equivalents at end of period | $ 375,172 | $ 359,171

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- Definition The cash inflow from sale of machinery and equipment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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