Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies- Solar Tariff Contingency (Details)

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Commitments and Contingencies- Solar Tariff Contingency (Details) - Unfavorable Regulatory Action
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2012
Dec. 31, 2014
Sep. 30, 2014
Mar. 31, 2015
Loss Contingencies [Line Items]        
Anti-dumping duty rate       31.18%
Solar tariff, countervailing duty rate prior to increase 3.61% 3.61% 3.61%  
Solar tariff, countervailing duty rate 15.24%      
Maximum        
Loss Contingencies [Line Items]        
Anti-dumping duty rate 249.96%