Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
Dec. 31, 2017
Computer equipment and software
Property and Equipment
Estimated useful lives of the assets	3 years
Equipment
Property and Equipment
Estimated useful lives of the assets	5 years
Furniture and fixtures
Property and Equipment
Estimated useful lives of the assets	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.

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