Quarterly report pursuant to Section 13 or 15(d)

Recent Accounting Pronouncements - Narrative (Details)

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Recent Accounting Pronouncements - Narrative (Details) - Accounting Standards Update 2017-12 - USD ($)
$ in Thousands
Jan. 01, 2018
Dec. 31, 2017
Accumulated Deficit    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Impact of Adoption   $ 605
Accumulated Deficit | New Accounting Pronouncement, Early Adoption, Effect    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Impact of Adoption $ 605  
Accumulated Other Comprehensive Income (Loss)    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Impact of Adoption   (605)
Accumulated Other Comprehensive Income (Loss) | New Accounting Pronouncement, Early Adoption, Effect    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Impact of Adoption $ (605) $ (605)