CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net loss		$ (18,924)	$ (24,350)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		11,690	13,144
Stock-based compensation		6,312	6,706
Provision for bad debts		817	219
Loss on the disposition of property, equipment and other assets		137	0
Provision for deferred income taxes		(106)	(498)
Impairment of assets		1,100	180
Changes in operating accounts:
Accounts receivable		1,568	(2,928)
Inventories		(2,694)	(5,192)
Prepaid expenses and other current assets		(14,298)	354
Accounts payable		6,616	(11,987)
Deferred revenue and customer deposits		10,242	11,811
Accrued and other current liabilities		(8,068)	(5,531)
All other operating activities		3,323	2,914
Net cash used in operating activities		(2,285)	(15,158)
Cash flows from investing activities:
Purchases of property and equipment		(4,366)	(8,837)
Proceeds from sale of assets		552	0
Purchase of noncontrolling interest		(12,500)	(2,500)
Other investing activities		(284)	(37)
Net cash used in investing activities		(16,598)	(11,374)
Cash flows from financing activities:
Proceeds from borrowings		0	100,000
Repayment of borrowings/long term debt		(627)	(25,000)
Proceeds from inventory financing agreements		2,509	0
Payments related to net-share settlement of stock based compensation		(949)	(483)
Other financing activities		296	(780)
Net cash provided by financing activities		1,229	73,737
Effect of exchange rate changes on cash, cash equivalents and restricted cash		(3,241)	57
Net (decrease) increase in cash, cash equivalents and restricted cash		(20,895)	47,262
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]	113,722	158,181
Supplemental cash flow information
Cash interest payments		1,069	642
Cash income tax payments, net		1,832	4,862
Transfer of equipment from inventory to property and equipment, net	[2]	350	154
Noncash financing activity
Purchase of noncontrolling interest	[3]	$ 0	$ (11,000)

[1] The amounts for cash and cash equivalents shown above include restricted cash of $946 and $921 as of March 31, 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.

[3] 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 sheets.