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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (20,977) $ (9,911)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 15,186 14,973
Stock-based compensation 7,128 7,131
Impairment of property and other assets 38 53
Impairment of cost method investments 1,373 0
Provision for bad debts 1,017 155
Provision for deferred income taxes (898) (1,069)
Changes in operating accounts, net of acquisitions:    
Accounts receivable (3,774) 5,672
Inventories (5,571) (4,116)
Prepaid expenses and other current assets (3,667) 41
Accounts payable (647) (691)
Accrued and other current liabilities 12,597 12,403
All other operating activities (3,344) (5,253)
Net cash (used in) provided by operating activities (1,539) 19,388
Cash flows from investing activities:    
Purchases of property and equipment (10,764) (5,620)
Additions to license and patent costs (230) (280)
Cash paid for acquisitions, net of cash assumed 0 (34,291)
Proceeds from disposition of property and equipment 0 24
Net cash used in investing activities (10,994) (40,167)
Cash flows from financing activities:    
Payments on earnout consideration (2,675) (3,206)
Payments related to net-share settlement of stock-based compensation (837) (1,088)
Repayment of capital lease obligations (128) (120)
Net cash used in financing activities (3,640) (4,414)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 1,438 1,926
Net decrease in cash, cash equivalents and restricted cash (14,735) (23,267)
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] 122,096 161,981
Supplemental Cash Flow Information [Abstract]    
Cash interest payments 119 200
Cash income tax payments, net 2,332 573
Transfer of equipment from inventory to property and equipment, net (b) [2] 666 5,379
Transfer of equipment to inventory from property and equipment, net (c) [3] 360 718
Stock issued for acquisitions 0 3,208
Restricted cash included in other assets $ 489 $ 318
[1] The amounts for cash and cash equivalents shown above include restricted cash of $489 and $318 as of March 31, 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.