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Summary of Significant Accounting Policies - Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2017
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and Equipment Estimated useful lives	P7Y
Laboratory Equipment
Property, Plant and Equipment [Line Items]
Property and Equipment Estimated useful lives	P5Y
Office Equipment
Property, Plant and Equipment [Line Items]
Property and Equipment Estimated useful lives	P5Y
Computer Equipment
Property, Plant and Equipment [Line Items]
Property and Equipment Estimated useful lives	P5Y
Computer Software
Property, Plant and Equipment [Line Items]
Property and Equipment Estimated useful lives	P3Y
Minimum
Property, Plant and Equipment [Line Items]
Property and Equipment Estimated useful lives	P3Y
Maximum
Property, Plant and Equipment [Line Items]
Property and Equipment Estimated useful lives	P7Y

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://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=84158767&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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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