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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities    
Net loss $ (23,886,000) $ (85,978,000)
Adjustments to reconcile net loss to cash from operating activities    
Depreciation and amortization 16,107,000 19,718,000
Equity-based compensation expense 2,872,000 2,146,000
Goodwill impairment 0 57,146,000
Loss on asset impairments and retirements 307,000 20,187,000
Amortization of deferred financing costs 97,000 97,000
Deferred tax provision (benefit) 0 (1,690,000)
Provision for bad debts 209,000 1,280,000
(Gain) loss on disposal of assets (182,000) 60,000
Changes in fair value of investments (395,000) 2,411,000
Other 0 (381,000)
Changes in operating assets and liabilities    
Accounts receivable (6,806,000) (16,129,000)
Inventories (12,463,000) (1,855,000)
Other current assets (675,000) (814,000)
Other assets 267,000 139,000
Accounts payable and accrued liabilities 9,192,000 (14,860,000)
Deferred revenue 53,000 67,000
Other non-current liabilities (178,000) (3,796,000)
Net cash used in operating activities (15,481,000) (22,252,000)
Cash flows from investing activities    
Purchases of property, plant and equipment (2,346,000) (9,968,000)
Proceeds from sale of assets 2,073,000 70,000
Investment in intellectual property (1,608,000) 0
Other (75,000) (141,000)
Net cash used in investing activities (1,956,000) (10,039,000)
Cash flows from financing activities    
Repayments of borrowings (712,000) 0
Treasury shares withheld for taxes (1,900,000) (1,056,000)
Treasury share repurchase 0 (1,017,000)
Proceeds from the issuance of ESPP shares 447,000 552,000
Net cash used in financing activities (2,165,000) (1,521,000)
Effect of exchange rate changes on cash 1,350,000 9,327,000
Net decrease in cash, cash equivalents and restricted cash (18,252,000) (24,485,000)
Cash, cash equivalents and restricted cash at beginning of period 211,247,000 196,740,000
Cash, cash equivalents and restricted cash at end of period $ 192,995,000 $ 172,255,000