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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
NET LOSS | $ (3,425) | $ (1,293) | $ (1,659)
Adjustments to reconcile net income (loss) to net cash used in operating activities: |  |  |
Depreciation | 11 | 3 | 61
Amortization | 9 | 5 | 47
Stock-based compensation |  | 1 | 1
Impairment loss on property, plant and equipment |  |  | 109
Impairment loss on intangible assets |  |  | 15
Impairment losses on prepaid licensing and royalty fees | 0 | 0 | 85
Bad debt expense | 7 | 5 | 24
Gain on disposal of marketable securities and investments | (125) |  |
Loss of lawsuit contingent liabilities |  |  | 96
Net changes in: |  |  |
Accounts receivable | 3 | 89 | 130
Prepaid expenses | (313) | 25 | 10
Prepaid licensing and royalty fees | 96 | (87) | 306
Prepaid pension assets | (16) | 19 | (29)
Other assets | (151) | (90) | (15)
Accounts payable | 47 | 5 | (40)
Accrued expenses | (80) | 236 | (153)
Other liabilities | (198) | (993) | (555)
Net cash used in operating activities | (4,135) | (2,075) | (1,567)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchase of marketable securities |  | (10,000) |
Purchases of property, plant and equipment | (76) | (24) | (48)
Increase in intangible assets | (17) | (8) | (14)
Proceeds from disposal of marketable securities | 80 |  |
Decrease (increase) in refundable deposits | (4) | (9) | (2)
Other |  |  | (9)
Net cash used in investing activities | (17) | (10,041) | (73)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Net foreign currency exchange differences on cash, cash equivalents and restricted cash | (89) | (156) | 88
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH | (4,241) | (12,272) | (1,552)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF YEAR | 46,002 | 58,274 | 59,826
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR | 41,761 | $ 46,002 | 58,274
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: |  |  |
Income tax refund during the year | $ (2) |  | $ (6)

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