Annual report pursuant to Section 13 and 15(d)

Leases - Narrative (Details)

v3.21.1
Leases - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2020
ft²
Feb. 29, 2020
USD ($)
ft²
Aug. 31, 2015
ft²
Mar. 31, 2020
ft²
floor
leaseAgreement
Dec. 31, 2020
USD ($)
ft²
extensionOption
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]                
Lease liabilities | $         $ 2.2 $ 0.5    
Boston, Massachusetts                
Loss Contingencies [Line Items]                
Area of leased property (square feet)     3,950          
Freising, Germany                
Loss Contingencies [Line Items]                
Area of leased property (square feet)       19,000        
Number of lease agreements (lease agreements) | leaseAgreement       4        
Hallbergmoos, Germany                
Loss Contingencies [Line Items]                
Area of leased property (square feet)   105,000            
Lease term   12 years 6 months            
Number of agreement extension options (extension options) | extensionOption         2      
Lease renewal term         60 months      
Rent expense | $   $ 0.2            
Security deposit | $               $ 0.8
Tenant Improvements | $             $ 11.5  
Leases in same building | Freising, Germany                
Loss Contingencies [Line Items]                
Number of lease agreements (lease agreements) | leaseAgreement       3        
Number of floors (in floors) | floor       3        
Leases expected to be delivered by February 2020 | Hallbergmoos, Germany                
Loss Contingencies [Line Items]                
Area of leased property (square feet)   96,400            
Leases expected to be delivered by May 2020 | Hallbergmoos, Germany                
Loss Contingencies [Line Items]                
Area of leased property (square feet) 8,600              
Leases expected to be delivered by October 2024 | Hallbergmoos, Germany                
Loss Contingencies [Line Items]                
Area of leased property (square feet)         22,300      
Leases with first right of refusal for additional area | Hallbergmoos, Germany                
Loss Contingencies [Line Items]                
Area of leased property (square feet)         13,400