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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.