Nature of Business and Basis of Presentation (Details) |
3 Months Ended | |
|---|---|---|
Jan. 31, 2016 |
Jan. 31, 2015 |
|
| POSCO Energy [Member] | ||
| Common stock ownership percentage | 9.00% | |
| significant customer revenue percentage | 45.00% | 54.00% |
| NRG Energy [Member] | ||
| Common stock ownership percentage | 5.00% | |
| significant customer revenue percentage | 0.20% | 5.00% |