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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 | $ (1,293) | $ (1,659) | $ (3,193)
Adjustments to reconcile net income (loss) to net cash used in operating activities: |  |  |
Depreciation | 3 | 61 | 100
Amortization | 5 | 47 | 36
Stock-based compensation | 1 | 1 | 3
Impairment loss on property, plant and equipment |  | 109 |
Impairment loss on intangible assets |  | 15 |
Impairment losses on prepaid licensing and royalty fees | 0 | 85 | 244
Bad debt expense | 5 | 24 | 23
Loss of lawsuit contingent liabilities |  | 96 |
Net changes in: |  |  |
Accounts receivable | 89 | 130 | 205
Prepaid expenses | 25 | 10 | 267
Prepaid licensing and royalty fees | (87) | 306 | (220)
Prepaid pension assets | 19 | (29) | 14
Other assets | (90) | (15) | 35
Accounts payable | 5 | (40) | (210)
Accrued expenses | 236 | (153) | (1,273)
Other liabilities | (993) | (555) | 55
Net cash used in operating activities | (2,075) | (1,567) | (3,914)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchase of marketable securities | (10,000) |  |
Purchases of property, plant and equipment | (24) | (48) | (66)
Increase in intangible assets | (8) | (14) | (61)
Decrease (increase) in refundable deposits | (9) | (2) | 11
Other |  | (9) | 26
Net cash provided used in investing activities | (10,041) | (73) | (90)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Net foreign currency exchange differences on cash, cash equivalents and restricted cash | (156) | 88 | (347)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | (12,272) | (1,552) | (4,351)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF YEAR | 58,274 | 59,826 | 64,177
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR | $ 46,002 | 58,274 | $ 59,826
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: |  |  |
Income tax refund during the year |  | $ (6) |

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