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WARRANTY OBLIGATIONS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Product Warranty Liability [Line Items] |  |
Additional warranty expense | $ 7,655 | $ 1,677
Field Performance Data And Diagnostic Root-Cause Failure Analysis |  |
Product Warranty Liability [Line Items] |  |
Additional warranty expense | 6,300 | 1,500
Unit Costs For Prior Generation Microinverter Replacement Driven By Tariffs |  |
Product Warranty Liability [Line Items] |  |
Additional warranty expense | $ 1,300 | $ 200

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- Definition Amount of increase (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to preexisting product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(4)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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