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Related Parties - Closing of TerraForm Power Merger and Employment Agreement (Details) - Subsequent event - USD ($)
$ in Thousands
Oct. 16, 2017
Oct. 06, 2017
Chief financial officer    
Related Party Transaction [Line Items]    
Base salary   $ 25
Performance bonus percentage   60.00%
Merger and sponsorship transaction agreement (TERP Transaction Agreement)    
Related Party Transaction [Line Items]    
Payments (to) from related party $ 300  
Merger and sponsorship transaction agreement (TERP Transaction Agreement) | TerraForm Power    
Related Party Transaction [Line Items]    
Withholding for share based compensation (in shares) 150,933  
Merger and sponsorship transaction agreement (TERP Transaction Agreement) | TerraForm Power    
Related Party Transaction [Line Items]    
Payments (to) from related party $ (500)  
Payments related to tax withholding for share-based compensation $ 800  
TerraForm Power | Merger and sponsorship transaction agreement (TERP Transaction Agreement)    
Related Party Transaction [Line Items]    
Percentage of voting interests acquired 51.00%