Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies- Project Assets (Details)

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Summary of Significant Accounting Policies- Project Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Accounting Policies [Abstract]          
Interest costs capitalized $ 232 $ 0 $ 480 $ 395  
Minimum qualifying operating period for prorated repayments of grants     5 years    
Section 1603 grants   $ 3,727 $ 0    
Deferred grant income $ 8,429   $ 8,429   $ 8,842