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