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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES Geographic Net Revevnues (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 114,457 | $ 114,159 | $ 102,865 | $ 89,188 | $ 93,307 | $ 110,085 | $ 109,482 | $ 103,081 | $ 420,669 | $ 415,955 | $ 431,755
United States of America |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 10,662 | 15,315 | 16,647
Hong Kong/China |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 237,341 | 218,752 | 227,335
Taiwan |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 36,297 | 43,081 | 50,307
Korea |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 30,395 | 33,877 | 38,012
Western Europe (excluding Germany) |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 36,025 | 49,834 | 48,230
Japan |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 15,496 | 19,897 | 20,769
Germany |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 20,197 | 14,403 | 11,558
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Revenues by Geography [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 34,256 | $ 20,796 | $ 18,897

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