Summary of Significant Accounting Policies - Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2016
Computer equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Software
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Furniture
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Laboratory and office equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Leasehold improvements	Shorter of lease term or useful life