Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies- Project Assets (Details)

v3.2.0.727
Summary of Significant Accounting Policies- Project Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Accounting Policies [Abstract]          
Interest costs capitalized $ 134 $ 0 $ 248 $ 395  
Minimum qualifying operating period for prorated repayments of grants     5 years    
Section 1603 grants   $ 3,727 $ 0 $ 3,727  
Deferred grant income $ 8,567   $ 8,567   $ 8,842