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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
Contract With Customer, Liability [Roll Forward] |  |  |
Beginning balance at January 1 | $ 52,410 | $ 20,728 | $ 11,859
Upfront payments received from customers | 12,053 |  |
Upfront or annual incentive payments received | 1,772 |  |
Revenue recognized related to amounts that were included in beginning balance of deferred revenue | (9,860) | 9,764 | 4,830
Revenue recognized related to deferred revenue generated during the period | (973) |  |
Ending balance at December 31 | $ 55,402 | $ 52,410 | $ 20,728

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- Definition Contract With Customer, Liability + References No definition available. + Details
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- Definition Contract with Customer, Liability, Upfront Or Annual Incentive Payments Received + References No definition available. + Details
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- Definition Contract with Customer, Liability, Upfront Payments Received From Customers + References No definition available. + Details
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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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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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