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Summary of Significant Accounting Policies - Estimated Useful Lives of Long-Lived Assets (Details)
12 Months Ended
Dec. 31, 2018
Office furniture and equipment  
Property, Plant and Equipment [Line Items]  
Useful Life 5 years
Minimum | Laboratory equipment, computers and software  
Property, Plant and Equipment [Line Items]  
Useful Life 3 years
Maximum | Laboratory equipment, computers and software  
Property, Plant and Equipment [Line Items]  
Useful Life 5 years