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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating activities: |  |  |
Net loss | $ (54,162) | $ (58,452) | $ (66,049)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Allowance of bad debt | (32) | 32 | 0
Lower of cost or market reserve adjustment to inventory | 3,889 | 3,930 | 6,774
Depreciation and amortization | 25,371 | 24,733 | 24,014
Amortization of debt issuance costs | 865 | 900 | 892
Deferred income taxes, net | 0 | 7,348 | 14,570
Loss on disposal of assets | 1 | 15 | 13
Share-based compensation | 12,121 | 13,046 | 11,804
Interest for extinguishment of debt | (70) | 0 | 0
Extinguishment of debt | (6,229) | 0 | 0
Unrealized foreign exchange gain (loss) | 645 | (1,152) | (247)
Changes in operating assets and liabilities: |  |  |
Accounts receivable, trade | (7,020) | (8,421) | (4,351)
Notes receivable | (7,585) | (389) | (4)
Prepaid income tax | 1 | 188 | 961
Inventories | 15,786 | (23,674) | 1,562
Other current assets | 867 | 1,220 | 5,514
Operating right of use asset | 848 | 407 | 847
Accounts payable | 7,069 | (3,347) | 3,150
Accrued income taxes | 1 | 1 | 0
Accrued liabilities | (3,092) | 44 | (308)
Lease liability | (918) | (438) | (896)
Net cash used in by operating activities | (11,644) | (44,009) | (1,754)
Investing activities: |  |  |
Purchase of property, plant and equipment | (7,981) | (15,795) | (28,789)
Proceeds from disposal of equipment | 114 | 216 | 1
Deposits and prepaid for equipment | (2,222) | (3,279) | (2,688)
Purchase of intangible assets | (457) | (489) | (640)
Net cash used in investing activities | (10,546) | (19,347) | (32,116)
Financing activities: |  |  |
Proceeds from issuance of notes payable and long-term debt, net of debt issuance costs | 0 | 6,229 | 13,661
Principal payments of long-term debt and notes payable | (4,144) | (5,233) | (43,363)
Proceeds from line of credit borrowings | 122,935 | 95,730 | 83,434
Repayments of line of credit borrowings | (111,287) | (96,006) | (88,299)
Proceeds from bank acceptance payable | 24,622 | 39,958 | 13,638
Repayments of bank acceptance payable | (32,465) | (31,338) | (11,952)
Proceeds from issuance of convertible senior notes, net of debt issuance costs | 0 | (18) | 76,362
Principal payments of financing lease | (18) | (17) | (2)
Exercise of stock options | 8 | 13 | 14
Payments of tax withholding on behalf of employees related to share-based compensation | (960) | (1,080) | (897)
Proceeds from common stock offering, net | 15,397 | 39,203 | 0
Net cash provided by financing activities | 14,088 | 47,441 | 42,596
Effect of exchange rate changes on cash | (876) | (999) | 298
Net (decrease)/ increase in cash, cash equivalents and restricted cash | (8,978) | (16,914) | 9,025
Cash, cash equivalents and restricted cash at beginning of period | 50,115 | 67,029 | 58,004
Cash, cash equivalents and restricted cash at end of period | 41,137 | 50,115 | 67,029
Supplemental disclosure of cash flow information: |  |  |
Interest | 4,899 | 4,971 | 3,172
Income taxes | 1 | (364) | (890)
Non-cash investing and financing activities: |  |  |
Net change in accounts payable related to property and equipment additions | (4,027) | (2,326) | 3,869
Net change in deposits and prepaid for equipment related to property and equipment additions | $ 84 | $ (64) | $ 8,801

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