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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net loss $ (55,224) $ (44,448)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 46,146 45,731
Stock-based compensation 21,084 28,405
Lower of cost or market adjustment 12,883 10,723
Provision for bad debts 1,297 1,488
Expense (benefit) of deferred income taxes 1,674 (5,464)
Impairment of assets 324 8,590
Changes in operating accounts, net of acquisitions:    
Accounts receivable 10,777 36,357
Inventories (13,959) (26,236)
Prepaid expenses and other current assets (2,939) (1,619)
Accounts payable 3,463 (9,938)
Accrued and other current liabilities (4,734) (10,841)
Deferred revenue 2,869 1,763
All other operating activities (5,985) 3,729
Net cash provided by operating activities 17,676 38,240
Cash flows from investing activities:    
Cash paid for acquisitions, net of cash assumed (36,541)  
Purchases of property and equipment (21,072) (12,014)
Additions to license and patent costs (875) (790)
Other investing activities (2,350) (1,000)
Proceeds from disposition of property and equipment 271  
Net cash used in investing activities (60,567) (13,804)
Cash flows from financing activities:    
Payments on earnout consideration (3,206)
Payments related to net-share settlement of stock-based compensation (4,494) (1,507)
Repayment of capital lease obligations (297) (786)
Net cash used in financing activities (7,997) (2,293)
Effect of exchange rate changes on cash and cash equivalents 4,273 1,572
Net (decrease) increase in cash and cash equivalents (46,615) 23,715
Cash and cash equivalents at the beginning of the period 184,947 155,643
Cash and cash equivalents at the end of the period 138,332 179,358
Supplemental Cash Flow Information:    
Cash interest payments 378 633
Cash income tax payments, net 4,715 8,040
Transfer of equipment from inventory to property and equipment, net [1] 8,964 9,395
Transfer of equipment to inventory from property and equipment, net [2] 364 $ 349
Stock issued for acquisitions $ 3,208  
[1] 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.
[2] 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.