Summary of Significant Accounting Policies - Property and Equipment Estimated Useful Lives (Details)	9 Months Ended
Sep. 30, 2020
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Computer equipment and software	3 years
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Computer equipment and software	5 years
Laboratory Equipment
Property Plant And Equipment [Line Items]
Computer equipment and software	5 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Leasehold improvements	Shorter of useful life or remaining lease term

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://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

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