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CASH, CASH EQUIVALENTS AND SHORT AND LONG TERM INVESTMENTS - Summary of Unaudited Condensed Financial Information of Equity Method Investees (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating data: |  |  |
Revenue | $ 7,609 | $ 6,131 | $ 6,943
Gross profit | 4,904 | 4,847 | 4,841
Income (loss) from operations | (60) | (911) | (2,776)
Net income (loss) | (3,001) | (4,422) | (2,104)
Net income (loss) attributable to Equity method investees |  | (262) | (687)
Balance sheet data: |  |  |
Current assets | 6,061 | 13,550 | 20,527
Long-term assets | 666 | 1,289 | 2,545
Current liabilities | (7,633) | (9,672) | $ (70,213)
Long-term liabilities | $ (56,407) | $ (53,071) |

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