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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Deferred Rent   $ 25,000 $ 25,000
Right-of-use assets      
Operating lease right-of-use assets $ 810 1,029 0
Operating lease liabilities      
Current 802 916 0
Noncurrent 29 138 25
Deferred rent     $ 0
Adjustments Due to the Adoption of ASC 842      
Right-of-use assets      
Operating lease right-of-use assets $ 1,029    
Operating lease liabilities      
Current   916  
Noncurrent   $ 138