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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net loss $ (24,350) $ (20,971)
Adjustments to reconcile net loss to net cash used in by operating activities:    
Depreciation and amortization 13,144 15,186
Stock-based compensation 6,706 7,128
Provision for bad debts 219 1,017
Provision for deferred income taxes (498) (898)
Impairment of assets 180 1,411
Changes in operating accounts:    
Accounts receivable (2,928) (3,774)
Inventories (5,192) (5,571)
Prepaid expenses and other current assets 354 (3,667)
Accounts payable (11,987) (647)
Deferred revenue and customer deposits 11,811 10,018
Accrued and other current liabilities (5,531) 2,579
All other operating activities 2,914 (3,350)
Net cash used in operating activities (15,158) (1,539)
Cash flows from investing activities:    
Purchases of property and equipment (8,837) (10,764)
Other investing activities (37) (230)
Net cash used in investing activities (8,874) (10,994)
Cash flows from financing activities:    
Proceeds from borrowings 100,000 0
Repayment of borrowings/long term debt (25,000) 0
Purchase of noncontrolling interest (2,500) 0
Payments on earnout consideration 0 (2,675)
Other financing activities (1,263) (965)
Net cash provided by (used in) financing activities 71,237 (3,640)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 57 1,438
Net increase (decrease) in cash, cash equivalents and restricted cash 47,262 (14,735)
Cash, cash equivalents and restricted cash at the beginning of the period [1] 110,919 136,831
Cash, cash equivalents and restricted cash at the end of the period [1] 158,181 122,096
Supplemental Cash Flow Information [Abstract]    
Cash interest payments 642 119
Cash income tax payments, net 4,862 2,332
Transfer of equipment from inventory to property and equipment, net [2] 154 666
Transfer of equipment to inventory from property and equipment, net [3] 0 360
Restricted cash included in other assets 921 794
Purchase of noncontrolling interest [4] $ (11,000) $ 0
[1] The amounts for cash and cash equivalents shown above include restricted cash of $921 and $794 as of March 31, 2019 and 2018, respectively, and $921 and $487 as of December 31, 2018, and 2017, 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.
[4] Purchase of noncontrolling interest to be paid in installments over a four year period recorded to Accrued and other liabilities and Other liabilities on the condensed consolidated balance sheet.