Quarterly report pursuant to Section 13 or 15(d)

Leases - Narrative (Details)

v3.21.2
Leases - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2020
ft²
Feb. 29, 2020
USD ($)
ft²
Aug. 31, 2015
ft²
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
ft²
leaseAgreement
floor
Sep. 30, 2021
USD ($)
ft²
extensionOption
Sep. 30, 2020
USD ($)
Jul. 31, 2021
Mar. 31, 2019
USD ($)
Oct. 31, 2018
USD ($)
Loss Contingencies [Line Items]                      
Lease liabilities | $       $ 0.6 $ 0.6   $ 1.9 $ 1.5      
Boston, Massachusetts                      
Loss Contingencies [Line Items]                      
Area of leased property (square feet)     3,950                
Lease renewal term                 10 months    
Freising, Germany                      
Loss Contingencies [Line Items]                      
Area of leased property (square feet)           19,000          
Number of lease agreements (in lease agreements) | leaseAgreement           4          
Freising, Germany | Leases in same building                      
Loss Contingencies [Line Items]                      
Number of lease agreements (in lease agreements) | leaseAgreement           3          
Number of floors (in floors) | floor           3          
Hallbergmoos, Germany                      
Loss Contingencies [Line Items]                      
Area of leased property (square feet)   105,000                  
Lease renewal term       60 months     60 months        
Lease term   12 years 6 months                  
Number of agreement extension options | extensionOption             2        
Rent expense | $   $ 0.2                  
Security deposit | $                     $ 0.8
Tenant improvements | $                   $ 11.5  
Hallbergmoos, Germany | Leases expected to be delivered by February 2020                      
Loss Contingencies [Line Items]                      
Area of leased property (square feet)   98,400                  
Hallbergmoos, Germany | Leases expected to be delivered by May 2020                      
Loss Contingencies [Line Items]                      
Area of leased property (square feet) 5,100                    
Hallbergmoos, Germany | Leases expected to be delivered by October 2024                      
Loss Contingencies [Line Items]                      
Area of leased property (square feet)             22,300        
Hallbergmoos, Germany | Leases with first right of refusal for additional area                      
Loss Contingencies [Line Items]                      
Area of leased property (square feet)             13,400