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ORDINARY SHARE REPURCHASE AND ISSUANCE - Additional Information (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 12, 2014 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity, Class of Treasury stock |  |  |  |  |
Shares repurchased under program |  |  | 199,331 | 328,856 | 623,765
Value of shares repurchased |  |  | $ 374 | $ 1,049 | $ 2,525
Repurchase program November 2014 |  |  |  |  |
Equity, Class of Treasury stock |  |  |  |  |
Share repurchase program, Authorized amount | $ 40,000 |  |  |  |
Share repurchase program, Period in force | 24 months |  |  |  |
Share repurchase program, additional period |  | 2 years |  |  |

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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