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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 $ (28,287) $ (42,073)
Adjustments to reconcile net loss to cash from operating activities    
Depreciation and amortization 25,242 28,300
Equity-based compensation expense 2,574 2,280
Amortization of deferred financing costs 87 0
Deferred tax provision 3,618 0
Provision for bad debts 19 103
Loss on disposal of assets 227 235
Changes in fair value of investments (1,412) 191
Unrealized gain on derivative instruments (496) (561)
Other (500) 0
Changes in operating assets and liabilities    
Accounts receivable (14,734) (4,426)
Inventories (4,083) (2,469)
Other current assets 771 1,042
Other assets (245) 270
Accounts payable and accrued liabilities (13,184) (3,295)
Deferred revenue 22 (410)
Other non-current liabilities 611 (96)
Net cash used in operating activities (29,770) (20,909)
Cash flows from investing activities    
Purchases of property, plant and equipment and intangibles (8,145) (6,323)
Proceeds from sale of assets 14 1,639
Proceeds from sale of investments 12,539 30,969
Purchase of investments (5,195) (26,428)
Net cash used in investing activities (787) (143)
Cash flows from financing activities    
Repayments of borrowings (1,737) (1,455)
Treasury shares withheld for taxes (1,452) (1,035)
Proceeds from the issuance of ESPP shares 692 561
Net cash used in financing activities (2,497) (1,929)
Effect of exchange rate changes on cash (376) (1,255)
Net decrease in cash and cash equivalents (33,430) (24,236)
Cash and cash equivalents at beginning of period 186,212 213,015
Cash and cash equivalents at end of period $ 152,782 $ 188,779