Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
Dec. 31, 2017
Computer equipment
Property and equipment
Useful life	3 years
Software
Property and equipment
Useful life	3 years
Lab equipment and furniture \| Minimum
Property and equipment
Useful life	5 years
Lab equipment and furniture \| Maximum
Property and equipment
Useful life	10 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration