Summary of Significant Accounting Policies and Procedures - Schedule of Changes in Accrued Warranty Balance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance - beginning of the period	$ 8,607	$ 7,502
Increase in liability (including $16,983 related to MyPower contracts)	18,929	2,022
Change in estimate	(4,282)	(468)
Less warranty claims	(261)	(449)
Balance - end of the period	$ 22,993	$ 8,607