SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES Customer and Credit Risk Concentration (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Customer	Sep. 30, 2019 USD ($)	Dec. 31, 2019 Customer
Concentration Risk [Line Items]
NET REVENUES	$ 121,129	$ 114,159	$ 337,625	$ 306,212
Distributors [Member]
Concentration Risk [Line Items]
NET REVENUES	$ 85,300	$ 78,000	$ 256,100	$ 222,700
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk percentage benchmark	10.00%	10.00%	10.00%	10.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Avnet
Concentration Risk [Line Items]
Concentration risk, percentage of total net revenues	18.00%	11.00%	14.00%	11.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Honestar Technologies Co., Ltd.
Concentration Risk [Line Items]
Concentration risk, percentage of total net revenues	14.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Ten Customers
Concentration Risk [Line Items]
Concentration risk, percentage of total net revenues	65.00%	55.00%	56.00%	54.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Number of major customers | Customer			10		10
Concentration risk percentage benchmark for accounts receivable (more than)	10.00%		10.00%		10.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Avnet
Concentration Risk [Line Items]
Concentration risk percentage benchmark			29.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Powertech Distribution Ltd.
Concentration Risk [Line Items]
Concentration risk percentage benchmark			10.00%		10.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Honestar Technologies Co., Ltd.
Concentration Risk [Line Items]
Concentration risk percentage benchmark			10.00%
Accounts Receivable [Member] | Credit Concentration Risk [Member] | Ten Customers
Concentration Risk [Line Items]
Concentration risk percentage benchmark			74.00%		63.00%