Commitments and Contingencies - Textual (Details) € in Thousands					6 Months Ended	9 Months Ended
	Aug. 13, 2020 USD ($) ft²	Mar. 23, 2020 EUR (€)	Oct. 25, 2019 EUR (€)	Jun. 28, 2019 EUR (€)	Jun. 30, 2020 USD ($) ft²	Sep. 30, 2020 USD ($)
Jupiter, Florida Headquarters Lease
Long-term Purchase Commitment [Line Items]
Area of building rented | ft²	2,000				4,900
Monthly rental rate | $	$ 4,200				$ 9,700
Netherlands Office Lease
Long-term Purchase Commitment [Line Items]
Rent expense | $						$ 4,000
VTT Technical Research Centre of Finland Ltd
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
Commitment to pay, additional		€ 700
Commitment to pay, additional period coverage		19 months
Commitments, right to terminate contract notice period		90 days