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Employee Benefit Plans - Additional Information (Details) - shares shares in Thousands	1 Months Ended	9 Months Ended
	Jul. 31, 2018	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined contribution retirement plan, plan name		401(k) plan
2018 ESPP
Defined Benefit Plan Disclosure [Line Items]
Shares of common stock reserved for issuance	200	244
Common stock purchase price, discount rate	15.00%
Maximum | 2018 ESPP
Defined Benefit Plan Disclosure [Line Items]
Period of automatic annual increase in the share reserve	10 years
401(k) Plan
Defined Benefit Plan Disclosure [Line Items]
Defined contribution retirement plan, maximum employee contribution deferred		100.00%

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- Definition

Share based compensation arrangement by share based payment award period of automatic annual increases in share reserve.

+ References

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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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- 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.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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- Definition

Name of defined contribution plan designed to provide retirement benefits. Includes, but is not limited to, legal name of plan.

+ References

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- Definition

Discount rate from fair value on purchase date that participants pay for shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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