CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss		$ (129,764)	$ (64,972)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization		34,830	39,305
Stock-based compensation		16,621	19,221
Provision for inventory obsolescence and revaluation		10,894	0
Provision for bad debts		1,039	1,152
Loss on hedge accounting de-designation		1,235	0
Loss on the disposition of property, equipment and other assets		434	1,620
Provision for deferred income taxes		0	(1,346)
Impairment of goodwill and assets		54,072	1,728
Changes in operating accounts:
Accounts receivable		12,668	12,290
Inventories		(23,987)	6,481
Prepaid expenses and other current assets		(15,376)	(3,122)
Accounts payable		(9,166)	(12,885)
Deferred revenue and customer deposits		2,714	4,491
Accrued and other current liabilities		6,309	1,199
All other operating activities		4,828	4,922
Net cash (used in) provided by operating activities		(32,649)	10,084
Cash flows from investing activities:
Purchases of property and equipment		(11,015)	(18,265)
Proceeds from sale of assets		552	1,620
Purchase of noncontrolling interest		(12,500)	(2,500)
Other investing activities		504	(1,744)
Net cash used in investing activities		(22,459)	(20,889)
Cash flows from financing activities:
Proceeds from revolving credit facilities		20,000	0
Payments on revolving credit facilities		(20,000)	0
Proceeds from borrowings/long-term debt		0	100,000
Repayment of borrowings/long-term debt		(26,547)	(66,013)
Proceeds from issuance of common stock		25,003	0
Proceeds from inventory financing agreements		2,509	0
Payments related to net-share settlement of stock-based compensation		(5,034)	(3,029)
Other financing activities		296	(1,125)
Net cash (used in) provided by financing activities		(3,773)	29,833
Effect of exchange rate changes on cash, cash equivalents and restricted cash		526	(1,400)
Net (decrease) increase in cash, cash equivalents and restricted cash		(58,355)	17,628
Cash, cash equivalents and restricted cash at the beginning of the period	[1]	134,617	110,919
Cash, cash equivalents and restricted cash at the end of the period	[1]	76,262	128,547
Supplemental cash flow information
Cash interest payments		1,836	3,020
Cash income tax payments, net		2,861	8,984
Transfer of equipment from inventory to property and equipment, net	[2]	671	2,861
Noncash financing activity
Purchase of noncontrolling interest		$ 0	$ (11,000)

[1] The amounts for cash and cash equivalents shown above include restricted cash of $998 and $931 as of September 30, 2020 and 2019, respectively, and $952 and $921 as of December 31, 2019, and 2018, 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 we require additional machines for training or demonstration or for placement into on demand manufacturing services locations.