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Leases - Narrative (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($) ft² | Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |
Lease cost | $ | $ 834 | $ 817
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, remaining lease term | 3 years 8 months 12 days |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease, remaining lease term | 9 years 9 months 19 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 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. + References No definition available. + Details
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