INVESTMENT IN PRIVATELY-HELD COMPANIES (Details) - AutoGrid Systems [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Feb. 02, 2021	Jan. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity method investments of preferred stock		$ 5,000	$ 11,643
Carrying value of non-marketable equity securities	$ 16,643

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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