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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Lease costs capitalized $ 7,900  
Hypothetical decrease to net income if previously capitalized leasing costs were expensed $ 6,000  
AOCI    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect adjustment related to adoption of new accounting standard   $ 211
Accumulated Deficit    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect adjustment related to adoption of new accounting standard   (211)
ASU No. 2017-12 | AOCI    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect adjustment related to adoption of new accounting standard   211
ASU No. 2017-12 | Accumulated Deficit    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect adjustment related to adoption of new accounting standard   $ (211)