Quarterly report pursuant to Section 13 or 15(d)

Borrowing Arrangements - Dutch landlord loan (Details)

v3.21.2
Borrowing Arrangements - Dutch landlord loan (Details) - Dutch Landlord Loan [Member]
€ in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
May 12, 2014
EUR (€)
Debt Instrument [Line Items]            
Aggregate principal amount $ 280   $ 280   $ 297 € 242
Interest rate 8.50%   8.50%   8.50%  
Interest expense $ 5 $ 5 $ 14 $ 14