Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Estimated Useful Life of Property and Equipment (Details)

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Summary of Significant Accounting Policies - Estimated Useful Life of Property and Equipment (Details)
12 Months Ended
Dec. 31, 2017
Laboratory equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 10 years
Laboratory equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 14 years
Office and computer equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 3 years
Office and computer equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful life 13 years