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SIGNIFICANT ACCOUNTING POLICIES - Schedule of effect of new accounting pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Prepaid and other current assets | $ 27,949 | $ 15,516 |  | $ 11,881
Deferred income tax assets | 96,224 | 87,664 |  | 20,156
Accumulated deficit | $ (640,909) | $ (592,654) |  | $ (708,354)
Cumulative effect adjustment |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Prepaid and other current assets |  |  | $ 1,903 |
Deferred income tax assets |  |  | (530) |
Accumulated deficit |  |  | 1,373 |
Adjusted balance |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Prepaid and other current assets |  |  | 13,784 |
Deferred income tax assets |  |  | 19,626 |
Accumulated deficit |  |  | $ (706,981) |

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