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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Limitation income tax, percentage	80.00%
Total provision for income taxes	$ 33	$ 0	$ 1
Operating loss carried forward	324,850
Remaining operating loss	$ 67,352
Hongwei
Income Tax Contingency [Line Items]
Income tax, percentage	15.00%	15.00%	15.00%
PRC
Income Tax Contingency [Line Items]
Tax rates subsidiaries, percentage	25.00%
Tax rates substantially lower	25.00%
Income tax, percentage	15.00%	15.00%	15.00%
Withholding income tax, percentage	10.00%
Operating loss carried forward	$ 257,498
United Kingdom
Income Tax Contingency [Line Items]
Income tax, percentage	19.00%	19.00%	19.00%
Germany
Income Tax Contingency [Line Items]
Income tax, percentage	27.90%	29.10%	31.90%

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