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Commitments and Contingencies - Narrative (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) facility | Mar. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items] |  |
Non-cash lease expense | $ | $ 267 | $ 316
Los Angeles, California |  |
Lessee, Lease, Description [Line Items] |  |
Number of facilities | 3 |
Number of facilities occupied | 2 |
Boston, Massachusetts |  |
Lessee, Lease, Description [Line Items] |  |
Number of facilities | 1 |
Dallas, Texas |  |
Lessee, Lease, Description [Line Items] |  |
Number of facilities | 1 |
Munich, Germany |  |
Lessee, Lease, Description [Line Items] |  |
Number of facilities | 1 |
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Term of contract | 1 year |
Renewal term | 12 months |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Term of contract | 3 years |
Renewal term | 5 years |

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- Definition Term of lessee's operating lease renewal, 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 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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