Summary of Significant Accounting Policies - Product Warranties (Details)	3 Months Ended	15 Months Ended	57 Months Ended
	Mar. 31, 2016	Dec. 31, 2020	Dec. 31, 2020
Commercial LEDFL Tubular LED Lamps (Excluding Battery Backup TLED), Troffer Luminaires, And Certain Globe Lights
Product Warranty Liability [Line Items]
Standard Product Warranty, Number of Years			10 years
Other LED Products
Product Warranty Liability [Line Items]
Standard Product Warranty, Number of Years		5 years	5 years
LEDFL Tubular LED Lamps (Excluding Red Caps)
Product Warranty Liability [Line Items]
Standard Product Warranty, Number of Years		10 years
Minimum
Product Warranty Liability [Line Items]
Standard Product Warranty, Number of Years	1 year
Minimum \| D-Series Lamps
Product Warranty Liability [Line Items]
Standard Product Warranty, Number of Years		5 years
Maximum
Product Warranty Liability [Line Items]
Standard Product Warranty, Number of Years	5 years
Maximum \| D-Series Lamps
Product Warranty Liability [Line Items]
Standard Product Warranty, Number of Years		10 years