Related Party Transactions - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Enphase Energy I N C
Related Party Transaction [Line Items]
Purchase from related party	$ 11.9	$ 8.9
Outstanding payables to related party	0.7	1.1
RECC
Related Party Transaction [Line Items]
Solar energy systems and products sales revenue	0.3	7.6
Accounts receivable	$ 0.0	$ 0.1