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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES (Tables) | 12 Months Ended
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Dec. 31, 2020
Concentration Risk [Line Items] |
Geographic net revenues |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) |  | 2020 |  | 2019 |  | 2018
United States of America | ​ | $ | 11,065 | ​ | $ | 10,662 | ​ | $ | 15,315
Hong Kong/China | ​ |  | 306,938 | ​ |  | 237,341 | ​ |  | 218,752
Taiwan | ​ |  | 21,650 | ​ |  | 36,297 | ​ |  | 43,081
Korea | ​ |  | 40,059 | ​ |  | 30,395 | ​ |  | 33,877
Western Europe (excluding Germany) | ​ |  | 33,564 | ​ |  | 36,025 | ​ |  | 49,834
Japan | ​ |  | 17,453 | ​ |  | 15,496 | ​ |  | 19,897
Germany | ​ |  | 23,242 | ​ |  | 20,197 | ​ |  | 14,403
Other | ​ |  | 34,347 | ​ |  | 34,256 | ​ |  | 20,796
Total net revenues | ​ | $ | 488,318 | ​ | $ | 420,669 | ​ | $ | 415,955
Revenue from Contract with Customer Benchmark [Member] |
Concentration Risk [Line Items] |
Schedules of Concentration of Risk [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
Customer |  | 2020 | ​ | 2019 | ​ | 2018
Avnet | ​ | 19 | % | ​ | 11 | % | ​ | 14 | %
Honestar Technologies Co., Ltd. |  | 11 | % | ​ | * | ​ | ​ | * | ​
________________________ *Total customer revenue was less than 10% of net revenues.
Accounts Receivable [Member] |
Concentration Risk [Line Items] |
Schedules of Concentration of Risk [Table Text Block] | The following customers represented 10% or more of accounts receivable:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
Customer |  | 2020 | ​ | 2019
Powertech Distribution Ltd. |  | 10 | % | ​ | 10 | %
Avnet |  | 50 | % | ​ | * | ​
________________________ *Total customer accounts receivable was less than 10% of net accounts receivables.

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