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Commitments and Contingencies - Textual (Details) |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 23, 2020 USD ($) | Oct. 25, 2019 EUR (€) | Jun. 28, 2019 EUR (€) | Mar. 31, 2020 USD ($) ft² | Jun. 28, 2019 USD ($)
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 |  |
Commitment to pay, expanded | € |  | € 690,000 |  |  |
Commitment to pay, expanded, period |  | 1 year 6 months |  |  |
Commitment to pay, additional | $ 700,000 |  |  |  |
Commitment to pay, additional coverage period | 19 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] |  |  |  |  |
Rent expense |  |  |  | $ 4,000 |

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- Definition Commitment Development Period + References No definition available. + Details
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