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Summary of Significant Accounting Policies - Recently Issued Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Adoption of new accounting pronouncements      
Accumulated other comprehensive income (loss) $ (13,287)   $ (8,568)
Future lease payments 22,624    
Total cash, cash equivalents and restricted cash $ 800    
Accounting Standards Update 2016-01 | Adjustment      
Adoption of new accounting pronouncements      
Accumulated other comprehensive income (loss)   $ 500