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Commitments and Contingencies - Textual (Details) € in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 25, 2019 EUR (€) | Jun. 28, 2019 EUR (€) | Feb. 01, 2019 USD ($) | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) ft²
VTT Technical Research Centre of Finland Ltd [Member] |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Commitment to pay |  | € 2,520 |  |  |
Commitment development period |  | 3 years |  |  |
Commitment success bonus award |  | € 450 |  |  |
Commitment to pay, expanded | € 690 |  |  |  |
Commitment to pay, expanded, period | 1 year 6 months |  |  |  |
Commitments, right to terminate contract notice period |  | 90 days |  |  |
Jupiter, Florida Headquarters Lease |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Area of building rented | ft² |  |  |  | 4,900 |
Monthly rental rate | $ |  |  |  | $ 9,700 |
Netherlands Office Lease |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |
Area of building rented | ft² |  |  |  |  | 258
Rent expense | $ |  |  | $ 4,000 |  | $ 4,700
Term of contract |  |  | 1 year |  |

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- Definition Term of lessee's 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/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=77888426&loc=SL77918673-209980 + Details
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