Stockholders' Equity - Schedule of Number of Shares of Common Stock Reserved for Future Issuances (Details)	Sep. 30, 2018 shares
Class Of Stock [Line Items]
Common stock reserved for future issuances	5,886,412
Outstanding Stock Awards
Class Of Stock [Line Items]
Common stock reserved for future issuances	1,369,602
Shares Available for Future Issuance under 2017 Stock Incentive Plan
Class Of Stock [Line Items]
Common stock reserved for future issuances	4,516,810

Aggregate number of common shares reserved for future issuance.

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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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant