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Commitments and Contingencies - Narrative (Details) € in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 EUR (€) facility | Jun. 30, 2021 USD ($) facility | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) facility
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease liability | $ |  |  |  |  |  | $ 983
Non-cash lease expense | $ | $ 92 | $ 301 |  | $ 167 | $ 647 |
Los Angeles, California |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of facilities |  |  | 3 | 3 |  |
Number of facilities occupied |  |  | 2 |  |  | 2
Boston, Massachusetts |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of facilities |  |  | 1 | 1 |  |
Dallas, Texas |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of facilities |  |  | 1 | 1 |  |
Munich, Germany |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Contract termination fee | € |  |  | € 125 |  |  |
Operating lease liability | € |  |  | 316 |  |  |
Termination of lease |  |  | € 191 | $ 227 |  |
Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract |  |  | 1 year |  |  | 1 year
Renewal term |  |  | 12 months |  |  | 12 months
Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Term of contract |  |  | 3 years |  |  | 3 years
Renewal term |  |  | 5 years |  |  | 5 years

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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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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=123408670&loc=SL77918673-209980 + Details
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