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401(k) Plan and ESPP - Employee Stock Purchase Plan (Details) - USD ($) $ in Millions	Dec. 31, 2020	Oct. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for issuance (in shares)	1,596,323
Value of rights granted	$ 1.1
Employee stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for issuance (in shares)		1,700,000

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- Definition

Employee Stock Purchase Plan, Rights, Granted, Value

+ References

No definition available.

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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=120391452&loc=d3e13212-122682

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