Summary of Significant Accounting Policies - Property and Equipment Useful Lives (Details)	12 Months Ended
Dec. 31, 2016
Laboratory equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	P8Y
Laboratory equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	P4Y
Office and computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	P3Y
Furniture, fixtures and fittings \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	P10Y
Furniture, fixtures and fittings \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	P5Y

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=68058157&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223

Name:	us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration