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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities: |  |  |
Net loss |  | $ (64,972) | $ (41,123)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization |  | 39,305 | 44,986
Stock-based compensation |  | 19,221 | 21,082
Provision for bad debts |  | 1,152 | 2,522
Loss on the disposition of property, equipment and other assets |  | 1,620 | 0
Provision for deferred income taxes |  | (1,346) | (3,132)
Impairment of assets |  | 1,728 | 1,411
Changes in operating accounts: |  |  |
Accounts receivable |  | 12,290 | (1,509)
Inventories |  | 6,481 | (29,502)
Prepaid expenses and other current assets |  | (3,122) | 41,589
Accounts payable |  | (12,885) | 6,261
Deferred revenue and customer deposits |  | 4,491 | (37)
Accrued and other current liabilities |  | 1,199 | (45,309)
All other operating activities |  | 4,922 | (170)
Net cash provided by (used in) operating activities |  | 10,084 | (2,931)
Cash flows from investing activities: |  |  |
Purchases of property and equipment |  | (18,265) | (28,323)
Proceeds from sale of assets |  | 1,620 | 9
Other investing activities |  | (1,744) | (1,236)
Net cash used in investing activities |  | (18,389) | (29,550)
Cash flows from financing activities: |  |  |
Proceeds from borrowings |  | 100,000 | 0
Repayment of borrowings/long term debt |  | (66,013) | 0
Payments related to net-share settlement of stock based compensation |  | (3,029) | (5,723)
Purchase of noncontrolling interest |  | (2,500) | 0
Payments on earnout consideration |  | 0 | (2,675)
Other financing activities |  | (1,125) | (508)
Net cash provided by (used in) financing activities |  | 27,333 | (8,906)
Effect of exchange rate changes on cash, cash equivalents and restricted cash |  | (1,400) | (2,417)
Net increase (decrease) in cash, cash equivalents and restricted cash |  | 17,628 | (43,804)
Cash, cash equivalents and restricted cash at the beginning of the period | [1] | 110,919 | 136,831
Cash, cash equivalents and restricted cash at the end of the period | [1] | 128,547 | 93,027
Supplemental Cash Flow Information [Abstract] |  |  |
Cash interest payments |  | 3,020 | 353
Cash income tax payments, net |  | 8,984 | 7,119
Transfer of equipment from inventory to property and equipment, net | [2] | 2,861 | 4,638
Transfer of equipment to inventory from property and equipment, net | [3] | 30 | 628
Purchase of noncontrolling interest | [4] | $ (11,000) | $ 0
[1] | The amounts for cash and cash equivalents shown above include restricted cash of $931 and $934 as of September 30, 2019 and 2018, respectively, and $921 and $487 as of December 31, 2018, and 2017, respectively, which were included in Other assets, net, in the condensed consolidated balance sheets.
[2] | Inventory is transferred from inventory to property and equipment at cost when the Company requires 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 the Company has 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 liabilities and Other liabilities on the condensed consolidated balance sheets.

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