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INCOME TAXES - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |
State income taxes, net of federal benefits, and state tax credits | $ 6,487 | $ 5,297 | $ 720
Change in valuation allowances | (4,474) | (10,074) | (7,727)
Non-deductible stock-based compensation expense | 3,803 | 6,355 | 3,239
Accumulated deficit | (1,320,886) | (1,032,876) |
Operating loss carryforwards, domestic | 24,100 |  |
Operating loss carryforwards, state and local | 77,500 |  |
Operating loss carryforwards, foreign | 465,200 |  |
Unrecognized tax benefits that would impact effective tax rate | 19,900 | 25,100 | 33,300
Income tax examination, penalties and interest expense | 1,000 | 1,400 | 1,600
Income tax examination, penalties and interest accrued | 4,900 | 4,900 |
Income tax benefits recognized as a result of new estimates | 8,900 | $ 12,300 | 7,900
International |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income tax examination, penalties and interest expense | 126,400 |  |
Decrease in unrecognized tax benefits is reasonably possible | $ 3,400 |  |
Revision of Prior Period, Adjustment |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
State income taxes, net of federal benefits, and state tax credits |  |  | 2,000
Change in valuation allowances |  |  | 3,800
Non-deductible stock-based compensation expense |  |  | $ 7,300

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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