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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities: |  |  |
Net loss |  | $ (29,573) | $ (17,909)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Depreciation and amortization |  | 29,948 | 30,575
Stock-based compensation |  | 13,734 | 14,450
Impairment of assets |  | 1,411 | 0
Provision for bad debts |  | 1,356 | 166
Provision for deferred income taxes |  | (2,287) | (1,580)
Changes in operating accounts, net of acquisitions: |  |  |
Accounts receivable |  | (3,384) | 5,549
Inventories |  | (14,937) | (9,766)
Prepaid expenses and other current assets |  | (6,739) | (2,345)
Accounts payable |  | 2,762 | 4,343
Accrued and other current liabilities |  | 19,208 | (6,727)
All other operating activities |  | (2,328) | 1,823
Net cash provided by operating activities |  | 9,171 | 18,579
Cash flows from investing activities: |  |  |
Purchases of property and equipment |  | (18,095) | (11,243)
Additions to license and patent costs |  | (523) | (571)
Cash paid for acquisitions, net of cash assumed |  | 0 | (34,291)
Other investing activities |  | 0 | (1,650)
Proceeds from disposition of property and equipment |  | 9 | 271
Net cash used in investing activities |  | (18,609) | (47,484)
Cash flows from financing activities: |  |  |
Payments on earnout consideration |  | (2,675) | (3,206)
Payments related to net-share settlement of stock-based compensation |  | (1,804) | (1,970)
Repayment of capital lease obligations |  | (344) | (290)
Net cash used in financing activities |  | (4,823) | (5,466)
Effect of exchange rate changes on cash, cash equivalents and restricted cash |  | (2,502) | 3,602
Net decrease in cash, cash equivalents and restricted cash |  | (16,763) | (30,769)
Cash, cash equivalents and restricted cash at the beginning of the period (a) | [1] | 136,831 | 185,248
Cash, cash equivalents and restricted cash at the end of the period (a) | [1] | 120,068 | 154,479
Supplemental Cash Flow Information [Abstract] |  |  |
Cash interest payments |  | 236 | 400
Cash income tax payments, net |  | 3,925 | 3,367
Transfer of equipment from inventory to property and equipment, net (b) | [2] | 3,618 | 7,689
Transfer of equipment to inventory from property and equipment, net (c) | [3] | 369 | 907
Stock issued for acquisitions |  | 0 | 3,208
Restricted cash included in other assets |  | $ 755 | $ 488
[1] | The amounts for cash and cash equivalents shown above include restricted cash of $755 and $488 as of June 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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