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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 06, 2018
--- | --- | --- | --- | ---
Cash |  |  |  |
Deposit with non-insured institutions | $ 32,300 |  |  |
Guyanese dollars |  |  |  |
Cash |  |  |  |
Cash (in GYD) | $ 5,700 | $ 6,600 |  |
U.S. Solar Operations | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Cash |  |  |  |
Amount of restricted cash disposed |  |  | $ 8,400 | $ 8,407

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