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Commitments and Contingencies - Textual (Details) |  |  | 6 Months Ended
--- | --- | --- | ---
Jun. 28, 2019 EUR (€) | Feb. 01, 2019 USD ($) | Jun. 30, 2019 USD ($) ft²
VTT Technical Research Centre of Finland Ltd |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Commitment to pay | € | € 2,520,000 |  |
Commitment development period | 3 years |  |
Commitment success bonus award | € | € 450,000 |  |
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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