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Leases - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020 ft² lease	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items]
Lessee, operating lease, area of land under lease	13,500
Lease, cost | $		$ 3.4	$ 3.2	$ 3.4
Number of lease agreements entered into | lease	2
Minimum
Operating Leased Assets [Line Items]
Operating lease, remaining lease term	2 years 10 months 24 days	2 years 10 months 24 days
Maximum
Operating Leased Assets [Line Items]
Operating lease, remaining lease term	9 years	9 years
San Diego, California
Operating Leased Assets [Line Items]
Lessee, operating lease, area of land under lease		82,200
Plymouth Meeting, Pennsylvania
Operating Leased Assets [Line Items]
Lessee, operating lease, area of land under lease		57,360

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- Definition

Lessee, Number Of Lease Agreements Entered Into

+ References

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Lessee, Operating Lease, Area of Land Under Lease

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- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
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-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971

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- Definition

Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

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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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