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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net loss $ (9,911) $ (17,812)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 14,973 15,089
Stock-based compensation 7,131 11,667
Provision for bad debts 155 2,388
Benefit of deferred income taxes (1,069) (1,092)
Changes in operating accounts, net of acquisitions:    
Accounts receivable 5,336 21,544
Inventories (4,120) (7,984)
Prepaid expenses and other current assets 12 (434)
Accounts payable (643) (5,956)
Accrued and other current liabilities (2,849) (4,056)
Deferred revenue 11,218 11,019
All other operating activities (852) (6,255)
Net cash provided by operating activities 19,381 18,118
Cash flows from investing activities:    
Cash paid for acquisitions, net of cash assumed (34,291)  
Purchases of property and equipment (5,620) (4,246)
Additions to license and patent costs (280) (231)
Proceeds from disposition of property and equipment 24  
Net cash used in investing activities (40,167) (4,477)
Cash flows from financing activities:    
Payments on earnout consideration (3,206)  
Repurchase of stock, net, and employer paid tax on employee awards (1,088) (810)
Repayment of capital lease obligations (142) (262)
Net cash used in financing activities (4,436) (1,072)
Effect of exchange rate changes on cash and cash equivalents 1,937 1,562
Net increase (decrease) in cash and cash equivalents (23,285) 14,131
Cash and cash equivalents at the beginning of the period 184,947 155,643
Cash and cash equivalents at the end of the period 161,662 169,774
Supplemental Cash Flow Information:    
Cash interest payments 200 214
Cash income tax payments, net 573 1,707
Transfer of equipment from inventory to property and equipment, net [1] 5,379 5,760
Transfer of equipment to inventory from property and equipment, net [2] 718 $ 1,779
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 parts 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.