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Summary of Significant Accounting Policies - Schedule of Property and Equipment (Detail)	3 Months Ended
	Mar. 31, 2019
Furniture and Fixtures [Member]
Estimated useful life	3 years
Computer Equipment [Member]
Estimated useful life	3 years
Software Development [Member]
Estimated useful life	3 years
Laboratory Equipment [Member] | Minimum [Member]
Estimated useful life	3 years
Laboratory Equipment [Member] | Maximum [Member]
Estimated useful life	10 years
Leasehold Improvements [Member]
Estimated useful life	10 years
Estimated useful life	Shorter of lease term or 10 years

X

- Definition

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).

+ References

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

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

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- Details

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Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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- Details

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- Details

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- Details

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