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Commitments and Contingencies - Summary of Accrued Warranty Activity (Details) - Solar Power System Performance Warranty - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]        
Balance at the beginning of the period $ 138 $ 226 $ 196 $ 237
Settlements during the period (22) (80) (51) (156)
Adjustments during the period (52) (6) (81) 59
Balance at the end of the period $ 64 $ 140 $ 64 $ 140