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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net loss | $ (6,900) | $ (8,330) | $ (8,214)
Adjustments to reconcile net loss to net cash from operating activities: |  |  |
Depreciation | 4,418 | 5,320 | 5,500
Amortization of special survey costs | 253 | 240 | 133
Amortization and write-off of financing costs | 328 | 258 | 386
Vessel impairment charge |  |  | 2,282
Gain from debt extinguishment |  |  | (4,306)
Loss from financial derivative instrument | 1 | 27 | 19
Loss on vessel held-for-sale |  | 2,756 |
Gain on sale of vessel, net | (7) |  |
Bad debt provisions |  | 26 | 13
Issuance of common stock under the promissory note | 169 | 113 |
Changes in assets and liabilities: |  |  |
Inventories | (180) | 306 | 209
Trade accounts receivable, net | 571 | 1,316 | (1,895)
Due from related parties | (2,308) |  |
Prepayments and other assets | 239 | (210) | 227
Special surveys cost | (1,068) | (435) | (588)
Trade accounts payable | (939) | (274) | 2,499
Due to related parties | (6,849) | 3,447 | 1,277
Hire collected in advance | (689) | 993 | 422
Accrued and other liabilities | (69) | 108 | (167)
Net cash (used in) / provided by operating activities | (13,030) | 5,661 | (2,203)
Cash flows from investing activities: |  |  |
Advances for ballast water treatment system |  | (47) |
Proceeds from the sale of vessel, net | 13,197 |  |
Vessel additions | (25) |  |
Ballast water treatment system installation | (542) | (470) | (99)
Net cash (used in) / provided by investing activities | 12,630 | (517) | (99)
Cash flows from financing activities: |  |  |
Proceeds from long-term debt | 15,250 |  | 44,500
Repayment of long-term debt | (19,909) | (4,503) | (43,640)
Gross proceeds from issuance of common stock |  | 354 | 315
Common stock offerings costs | (57) | (23) | (407)
Gross proceeds from the issuance of Series A Convertible Preferred Shares | 4,571 |  |
Series A Convertible Preferred Shares offering costs | (260) |  |
Dividend distributions declared and paid | (69) |  |
Payment for financial derivative instrument |  |  | (47)
Payment of financing costs | (265) |  | (908)
Net cash used in financing activities | (739) | (4,172) | (187)
Net (decrease) / increase in cash and cash equivalents and restricted cash | (1,139) | 972 | (2,489)
Cash and cash equivalents and restricted cash at the beginning of the year | 5,176 | 4,204 | 6,693
Cash and cash equivalents and restricted cash at end of the year | 4,037 | 5,176 | 4,204
SUPPLEMENTAL INFORMATION: |  |  |
Cash paid for interest | 4,432 | 5,163 | 4,283
Non-cash financing activities - issuance of common stock under the promissory note | 226 | 113 |
Unpaid portion of ballast water treatment system installation | 174 | 56 |
Unpaid portion for common stock offering costs | $ 35 | $ 57 |

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