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INCOME TAX - Change in Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |
Valuation allowance, beginning of period | $ (72,042) | $ (23,390) | $ (16,550)
Valuation allowance, end of period | (132,531) | (72,042) | (23,390)
Net operating loss carryforwards | Foreign Tax Authority |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |
Valuation allowance, change | (63,113) | (26,439) | (7,979)
Net operating loss carryforwards | Domestic Tax Authority |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |
Valuation allowance, change | 2,178 | (307) | 1,145
Income tax credit carryforward | Foreign Tax Authority |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |
Valuation allowance, change | (2,486) | (15,226) |
Income tax credit carryforward | State Tax Authority |  |  |
Movement in Deferred Tax Valuation Allowance [Roll Forward] |  |  |
Valuation allowance, change | $ 2,932 | $ (6,680) | $ (6)

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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