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REVENUE - Contract Balances (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in Contract with Customer, Liability [Abstract] |  |  |
Beginning balance at January 1 | $ 52,410 | $ 20,728 | $ 11,859
Upfront payments received from customers |  | 40,481 | 6,698
Upfront or annual incentive payments received |  | 8,015 | 8,240
Revenue recognized related to amounts that were included in beginning balance of deferred revenue | 9,860 | (9,764) | (4,830)
Revenue recognized |  | (7,050) | (1,239)
Ending balance at December 31 | $ 55,402 | $ 52,410 | $ 20,728

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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