GOODWILL AND INTANGIBLE ASSETS - Amortization Expense (Details) - USD ($) $ in Thousands		3 Months Ended
	Aug. 09, 2018	Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 1,247	$ 1,182
Developed technology, and patents and licensed technology
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		546	546
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 701	$ 636
SunPower’s
Finite-Lived Intangible Assets [Line Items]
Agreement for exclusive supplier rights, period	5 years
SunPower’s | Developed technology, and patents and licensed technology
Finite-Lived Intangible Assets [Line Items]
Amortization period for acquired intangible assets	6 years
SunPower’s | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization period for acquired intangible assets	9 years