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Leases - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 ft² lease | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2019
Operating Leased Assets [Line Items] |  |  |  |  |
Lessee, operating lease, area of land under lease | 13,500 |  |  |  |
Weighted-average remaining lease term | 8 years 2 months | 8 years 2 months |  |  |
Lease, cost | $ |  | $ 3.2 | $ 3.4 | $ 2.5 |
Number of lease agreements entered into | lease | 2 |  |  |  |
Minimum |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Weighted-average remaining lease term |  |  |  |  | 3 years 10 months 31 days
Maximum |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Weighted-average remaining lease term |  |  |  |  | 9 years 10 months 19 days
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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