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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Cash flows from operating activities: |  |  |
Net loss |  | $ (41,123) | $ (55,224)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities: |  |  |
Depreciation and amortization |  | 44,986 | 46,146
Stock-based compensation |  | 21,082 | 21,084
Lower of cost or market adjustment |  | 0 | 12,883
Provision for bad debts |  | 2,522 | 1,297
Provision for deferred income taxes |  | (3,132) | 1,674
Impairment of assets |  | 1,411 | 324
Changes in operating accounts, net of acquisitions: |  |  |
Accounts receivable |  | (1,509) | 10,777
Inventories |  | (29,502) | (13,959)
Prepaid expenses and other current assets |  | 41,589 | (2,939)
Accounts payable |  | 6,261 | 3,463
Accrued and other current liabilities |  | (45,346) | (1,865)
All other operating activities |  | (170) | (5,985)
Net cash (used in) provided by operating activities |  | (2,931) | 17,676
Cash flows from investing activities: |  |  |
Purchases of property and equipment |  | (28,323) | (21,072)
Additions to license and patent costs |  | (740) | (875)
Cash paid for acquisitions, net of cash assumed |  | 0 | (36,541)
Other investing activities |  | (496) | (2,350)
Proceeds from disposition of property and equipment |  | 9 | 271
Net cash used in investing activities |  | (29,550) | (60,567)
Cash flows from financing activities: |  |  |
Payments on earnout consideration |  | (2,675) | (3,206)
Payments related to net-share settlement of stock-based compensation |  | (5,723) | (4,494)
Repayment of capital lease obligations |  | (508) | (297)
Net cash used in financing activities |  | (8,906) | (7,997)
Effect of exchange rate changes on cash, cash equivalents and restricted cash |  | (2,417) | 4,273
Net decrease in cash, cash equivalents and restricted cash |  | (43,804) | (46,615)
Cash, cash equivalents and restricted cash at the beginning of the period | [1] | 136,831 | 184,947
Cash, cash equivalents and restricted cash at the end of the period | [1] | 93,027 | 138,332
Supplemental Cash Flow Information [Abstract] |  |  |
Cash interest payments |  | 353 | 378
Cash income tax payments, net |  | 7,119 | 4,715
Transfer of equipment from inventory to property and equipment, net | [2] | 4,638 | 8,964
Transfer of equipment to inventory from property and equipment, net | [3] | 628 | 364
Stock issued for acquisitions |  | 0 | 3,208
Restricted cash included in other assets |  | $ 934 | $ 482
[1] | The amounts for cash and cash equivalents shown above include restricted cash of $934 and $482 as of September 30, 2018 and 2017, respectively, and $487 and $301 as of December 31, 2017, and 2016, 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.

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