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Summary of Significant Accounting Policies - The Fair Value of Financial Instruments Carried at Fair Value (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]  
Contingent consideration $ 7,167
Total liabilities 7,167
Level 1  
Business Acquisition [Line Items]  
Contingent consideration 0
Total liabilities 0
Level 2  
Business Acquisition [Line Items]  
Contingent consideration 0
Total liabilities 0
Level 3  
Business Acquisition [Line Items]  
Contingent consideration 7,167
Total liabilities $ 7,167