Stock-Based Compensation - Summary of Common Stock Reserved for Future Issuance (Detail)	Dec. 31, 2018 shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding stock options and restricted stock units	3,539,863
Reserved for grants of future stock options and restricted stock units	2,980,762
Reserved for employee stock purchase plan	1,023,970
Total common stock reserved for future issuance	7,544,595

Common stock options and restricted stock units outstanding.

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- Definition

Common stock reserved for future issuance under employee stock purchase plan.

+ References

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- Definition

Common stock reserved for future issuance under stock option and restricted stock unit grants.

+ References

No definition available.

+ Details

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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