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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

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