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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2022
Mar. 12, 2021
Mar. 01, 2021
Mar. 31, 2020
Mar. 09, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]                
Accrued interest receivable $ 2,200,000 $ 2,100,000            
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepaid Expense and Other Assets, Current            
Asset impairments $ 1,200,000 $ 0 $ 0          
Goodwill, impairment loss 0 0 0          
Impairment of intangible assets $ 0 0 0          
Product warranty, term 25 years              
Advertising costs $ 3,800,000 16,200,000 $ 800,000          
Additional paid-in capital 819,119,000 837,924,000            
Retained earnings $ 17,335,000 $ (405,737,000)            
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Additional paid-in capital       $ (207,900,000)        
Convertible debt       244,500,000        
Deferred income tax liabilities       (62,300,000)        
Retained earnings       (25,700,000)        
Capitalized software costs                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Property, plant and equipment, useful life 3 years              
Monitoring Hardware And Service                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Capitalized contract cost, amortization period 6 years 6 months              
Microinverter, First and Second Generation                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Product warranty, term 15 years              
IQ Battery                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Product warranty, term 10 years              
IQ Gateway                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Product warranty, term 5 years              
Notes due 2025 | Convertible Notes                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt instrument face amount             $ 320,000,000 $ 320,000,000
Interest rate 1.00%           0.25% 0.25%
Notes due 2028 | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2020-06                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Additional paid-in capital       (117,300,000)        
Convertible debt       141,300,000        
Deferred income tax liabilities       (36,000,000)        
Retained earnings       $ (12,000,000)        
Notes due 2028 | Convertible Notes                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt instrument face amount           $ 575,000,000    
Interest rate           0.00%    
Total Convertible Senior Notes Due 2026 | Convertible Notes                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Debt instrument face amount         $ 632,500,000      
Interest rate         0.00%      
Minimum                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Property, plant and equipment, useful life 3 years              
Intangible assets, estimated useful life 5 years              
Period failure rate measurement lags product sale 3 months              
Minimum | Capitalized software costs                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Property, plant and equipment, useful life 3 years              
Minimum | Communication Accessories                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Service period 5 years              
Minimum | Subscription Contracts                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Service period 3 months              
Minimum | Third and Fourth Generation                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Product warranty, term 5 years              
Maximum                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Property, plant and equipment, useful life 10 years              
Intangible assets, estimated useful life 9 years              
Period failure rate measurement lags product sale 9 months              
Maximum | Capitalized software costs                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Property, plant and equipment, useful life 5 years              
Maximum | Communication Accessories                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Service period 12 years              
Maximum | Subscription Contracts                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Service period 12 months              
Maximum | Microinverter, Subsequent Generations                
Fair Value, Option, Quantitative Disclosures [Line Items]                
Product warranty, term 25 years