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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |  |
Net loss |  | $ (69,632) | $ (45,263) | $ (65,323)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |  |
Depreciation and amortization |  | 50,396 | 59,293 | 62,041
Stock-based compensation |  | 23,587 | 29,253 | 27,260
Lower of cost or market adjustment |  | 0 | 0 | 12,883
Provision for bad debts |  | 1,308 | 1,824 | 1,051
Loss on the disposition of property, equipment and other assets |  | 2,282 | 0 | 0
Provision for deferred income taxes |  | (3,354) | (2,990) | (5,567)
Impairment of assets |  | 1,728 | 1,998 | 2,427
Changes in operating accounts: |  |  |  |
Accounts receivable |  | 15,071 | 599 | 3,987
Inventories |  | 18,447 | (34,035) | (17,716)
Prepaid expenses and other current assets |  | 9,150 | 40,922 | (49,834)
Accounts payable |  | (16,846) | 11,559 | 12,448
Deferred revenue and customer deposits |  | 677 | (2,383) | (121)
Accrued and other current liabilities |  | 960 | (47,851) | 50,330
All other operating activities |  | (2,193) | (8,130) | (7,739)
Net cash provided by operating activities |  | 31,581 | 4,796 | 26,127
Cash flows from investing activities: |  |  |  |
Purchases of property and equipment |  | (23,985) | (40,694) | (30,881)
Cash paid for acquisition |  | 0 | 0 | (34,291)
Proceeds from sale of assets |  | 1,620 | 333 | 273
Purchase of noncontrolling interest |  | (2,500) | 0 | (2,250)
Other investing activities |  | (2,007) | (1,466) | (3,510)
Net cash used in investing activities |  | (26,872) | (41,827) | (70,659)
Cash flows from financing activities: |  |  |  |
Proceeds from borrowings |  | 100,000 | 25,000 | 0
Repayment of borrowings/long term debt |  | (76,768) | 0 | 0
Payments related to net-share settlement of stock based compensation |  | (3,194) | (7,367) | (5,545)
Payments on earnout consideration |  | 0 | (2,675) | (3,206)
Other financing activities |  | (1,338) | (694) | (437)
Net cash provided by (used in) financing activities |  | 18,700 | 14,264 | (9,188)
Effect of exchange rate changes on cash, cash equivalents and restricted cash |  | 289 | (3,145) | 5,303
Net increase (decrease) in cash, cash equivalents and restricted cash |  | 23,698 | (25,912) | (48,417)
Cash, cash equivalents and restricted cash at the beginning of the period | [1] | 110,919 | 136,831 | 185,248
Cash, cash equivalents and restricted cash at the end of the period | [1] | 134,617 | 110,919 | 136,831
Supplemental cash flow information |  |  |  |
Cash interest payments |  | 3,715 | 542 | 503
Cash income tax payments, net |  | 10,722 | 8,964 | 6,339
Transfer of equipment from inventory to property and equipment, net | [2] | 3,187 | 5,612 | 9,881
Transfer of equipment to inventory from property and equipment, net | [3] | 32 | 2,563 | 378
Issuance of stock for acquisitions |  | 0 | 0 | 3,208
Purchase of noncontrolling interest | [4] | $ (11,000) | $ 0 | $ 0
[1] | The amounts for cash and cash equivalents shown above include restricted cash of $952, $921 and $487 as of December 31, 2019, 2018 and 2017, respectively, which were included in Other assets, net, in the consolidated balance sheets.
[2] | Inventory is transferred from inventory to property and equipment at cost when we require additional machines for training or demonstration or for placement into on demand manufacturing services locations.
[3] | In general, an asset is transferred from Property and equipment, net, into inventory at its net book value when we have identified a potential sale for a used machine.
[4] | Purchase of noncontrolling interest to be paid in installments over a four-year period recorded to Accrued and other current liabilities and Other liabilities on the consolidated balance sheets.

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591551-111686 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3000-108585 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591552-111686 + Details
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