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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 income (loss) | $ (23,676) | $ (3,913) | $ 4,820
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation | 572 | 644 | 702
Lease amortization | 1,516 | 1,946 |
Net loss (gain) on disposal of assets |  | 5 | (21)
Gain on liquidation of a subsidiary |  |  | (909)
Reversal of ASC 460 reserve due to expiration of statute of limitations |  | (1,182) | (2,462)
Equity loss of associates |  |  | 613
Investment impairment | 1,029 |  | 370
Gain on reversal of accounts payable |  | (3,161) |
Stock-based compensation expense | 703 | 1,399 | 1,097
Allowance for credit losses | 9,441 | 4,396 | 812
Deferred income taxes | (1,499) | (465) | 705
Changes in operating assets and liabilities |  |  |
Accounts receivable | 18,767 | (21,561) | (44,815)
Inventories and deferred costs | (60) | 20,182 | 6,565
Prepaids and other assets | 600 | (3,625) | 5,540
Accounts payable | (5,754) | (19,882) | 23,193
Income taxes payable | (1,894) | 506 | (929)
Customer advances | 231 | (401) | (6,044)
Deferred revenue | (1,254) | (2,259) | (4,930)
Other liabilities | (2,122) | 3,224 | (10,413)
Net cash used in operating activities | (3,400) | (24,147) | (26,106)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchase of property, plant and equipment | (115) | (507) | (225)
Acquisition of uSTAR, net of cash acquired |  |  | (673)
Purchase of short-term investments |  | (41) |
Proceeds from sale of short-term investments | 2,095 | 41 | 3,143
Net cash provided by (used in) investing activities | 1,980 | (507) | 2,245
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from exercise of stock options |  | 56 | 101
Proceeds from short-term borrowing |  | 4,625 |
Repayment of short-term borrowing |  | (4,625) |
Repurchase of ordinary shares | (374) | (1,049) | (2,525)
Net cash used in financing activities | (374) | (993) | (2,424)
Effect of exchange rate changes on cash and cash equivalents | 1,575 | 554 | (701)
Net decrease in cash and cash equivalents | (219) | (25,093) | (26,986)
Cash, cash equivalents and restricted cash at beginning of year | 48,607 | 73,700 | 100,686
Cash, cash equivalents and restricted cash at end of year | 48,388 | 48,607 | 73,700
Cash paid: |  |  |
Interest paid | 10 | 16 | 47
Income taxes paid | $ 2,100 | $ 1,400 | $ 1,221

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