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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES Customer and Credit Risk Concentration (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
customer
segment
Mar. 31, 2020
USD ($)
Dec. 31, 2020
customer
Concentration Risk [Line Items]      
Number of reportable segments | segment 1    
NET REVENUES | $ $ 173,737 $ 109,664  
Distributors      
Concentration Risk [Line Items]      
NET REVENUES | $ $ 134,200 $ 83,500  
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]      
Concentration Risk [Line Items]      
Number of major customers | customer 10    
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Avnet      
Concentration Risk [Line Items]      
Concentration risk, percentage of total net revenues 31.00% 11.00%  
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Honestar Technologies Co., Ltd.      
Concentration Risk [Line Items]      
Concentration risk percentage 18.00%    
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Powertech Distribution Ltd.      
Concentration Risk [Line Items]      
Concentration risk percentage   11.00%  
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Ten Customers      
Concentration Risk [Line Items]      
Concentration risk, percentage of total net revenues 79.00% 55.00%  
Accounts Receivable [Member] | Credit Concentration Risk [Member]      
Concentration Risk [Line Items]      
Number of major customers | customer 10   10
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Avnet      
Concentration Risk [Line Items]      
Concentration risk percentage 58.00%   50.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Powertech Distribution Ltd.      
Concentration Risk [Line Items]      
Concentration risk percentage     10.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Ten Customers      
Concentration Risk [Line Items]      
Concentration risk percentage 86.00%   90.00%