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RELATED PARTY BALANCES AND TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Abstract]
Accounts payable	$ 4,510		$ 4,093
Purchase of materials	7,240	$ 2,211
Service fee charged by	142	46
Ninebell Co., Ltd [Member]
Related Party Transaction [Abstract]
Prepaid expenses	1,778		1,607
Accounts payable	2,925		2,898
Purchase of materials	6,882	2,153
Service fee charged by	0	0
Shengyi Semiconductor Technology Co., Ltd [Member]
Related Party Transaction [Abstract]
Accounts payable	1,585		$ 1,195
Purchase of materials	358	58
Service fee charged by	$ 142	$ 46

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Amount for prepaid expense to related parties.

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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Direct costs arising from transactions with related parties who are not affiliates or joint Ventures. These costs are categorized as cost of goods sold.

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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