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INCOME TAXES - Differences Between Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
U.S. federal income tax provision (benefit) at statutory rate | $ 18,485 | $ (61,805) | $ (2,842)
Foreign income and losses taxed at different rates | 5,000 | 8,608 | 5,529
State income taxes, net of federal benefits, and state tax credits | 4,897 | 6,487 | 5,297
Change in valuation allowances | (50,695) | (4,474) | (10,074)
Effect of income tax rate changes on deferred items | 815 | 618 | (3,443)
Adjustments related to uncertain tax positions | 2,588 | (15,518) | (12,418)
Non-deductible stock-based compensation expense | 2,727 | 3,803 | 6,355
Tax (windfalls)/shortfalls on stock-based compensation awards | (1,762) | 3,876 | 2,042
Federal research and development credits, net of adjustments | (396) | 6,043 | 3,447
Forgiveness of intercompany liabilities | (62) | (2,863) | 67
Net operating loss expiration | 0 | 19,962 | 12,537
Goodwill impairment | 0 | 23,202 | 0
Observable price change on an other equity investment | (17,955) | 0 | (8,644)
Non-deductible or non-taxable items | 4,035 | 4,557 | 2,908
Provision (benefit) for income taxes | $ (32,323) | $ (7,504) | $ 761

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123586238&loc=d3e38679-109324 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(9)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794 + Details
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