Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended			3 Months Ended		9 Months Ended
	Oct. 31, 2015	Jun. 30, 2015	Jan. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Other Commitments [Line Items]
Letters of credit outstanding, amount				$ 6.0		$ 6.0		$ 5.8
Capital Lease Obligations				17.8		$ 17.8		7.4
Photovoltaic Modules
Other Commitments [Line Items]
Purchase commitment with suppliers			$ 70.0
Long-term purchase commitment, period						12 months
Delivered purchase commitments				61.0		$ 61.0
Photovoltaic Modules | Subsequent Event
Other Commitments [Line Items]
Purchase commitment with suppliers	$ 146.0
Long term purchase commitment ending period	2016-12
Solar Energy System Modules
Other Commitments [Line Items]
Purchase commitment with suppliers		$ 32.0
Long term purchase commitment ending period						2016-12
Delivered purchase commitments				7.9		$ 7.9
Inverters
Other Commitments [Line Items]
Long term purchase commitment ending period						2016-03
Delivered purchase commitments				12.5		$ 12.5
Long term purchase commitment beginning period						2015-07
Capital Lease Obligations
Other Commitments [Line Items]
Lease obligation interest rates						10.00%
Non-Cancellable Operating Leases
Other Commitments [Line Items]
Operating lease expenses				1.6	$ 0.9	$ 4.2	$ 2.5
Deferred rent liabilities				$ 1.9		$ 1.9		$ 2.0
Minimum | Inverters
Other Commitments [Line Items]
Purchase commitment with suppliers		14.0
Maximum | Inverters
Other Commitments [Line Items]
Purchase commitment with suppliers		$ 20.0
Letter of Credit | Minimum
Other Commitments [Line Items]
Letter of credit, fee percentage						2.00%
Letter of Credit | Maximum
Other Commitments [Line Items]
Letter of credit, fee percentage						2.75%