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Leases - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) ft² | Sep. 30, 2018 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease, weighted average remaining lease term | 8 years 6 months |  | 8 years 6 months |
Lease cost | $ | $ 820 | $ 827 | $ 2,500 | $ 2,500
San Diego, California |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Area leased (in square feet) |  |  | 82,200 |
Plymouth Meeting, Pennsylvania |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Area leased (in square feet) |  |  | 57,360 |
Minimum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease, weighted average remaining lease term | 4 years 2 months 12 days |  | 4 years 2 months 12 days |
Maximum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease, weighted average remaining lease term | 10 years 3 months 18 days |  | 10 years 3 months 18 days |

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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=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for 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/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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