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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Summary of Equity Investee Data (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating data: |  |  |
Revenue | $ 6,131 | $ 6,943 |
Gross profit | 4,847 | 4,841 |
Income (loss) from operations | (911) | (2,776) | $ 950
Net income (loss) | (4,422) | (2,104) | 2,812
Net income (loss) attributable to Equity method investees | (262) | (687) | 984
Balance sheet data: |  |  |
Current assets | 13,550 | 20,527 | 18,616
Long-term assets | 1,289 | 2,545 | 105
Current liabilities | (9,672) | $ (70,213) | $ (11,669)
Long-term liabilities | $ (53,071) |  |

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