Quarterly report pursuant to Section 13 or 15(d)

Leases - Narrative (Details)

v3.20.2
Leases - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2020
ft²
Feb. 29, 2020
USD ($)
ft²
Aug. 31, 2015
ft²
Sep. 30, 2020
USD ($)
Mar. 31, 2020
ft²
lease_agreement
Sep. 30, 2020
USD ($)
ft²
extension_option
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]                
Lease liabilities | $       $ 0.6   $ 1.5    
Boston, Massachusetts                
Loss Contingencies [Line Items]                
Area of leased property     3,950          
Freising, Germany                
Loss Contingencies [Line Items]                
Area of leased property         19,000      
Number of lease agreements | lease_agreement         4      
Hallbergmoos, Germany                
Loss Contingencies [Line Items]                
Area of leased property   105,000            
Lease term   12 years 6 months            
Number of agreement extension options (in extension options) | extension_option           2    
Lease renewal term       60 months   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_agreement         3      
Leases expected to be delivered by February 2020 | Hallbergmoos, Germany                
Loss Contingencies [Line Items]                
Area of leased property   98,400            
Leases expected to be delivered by May 2020 | Hallbergmoos, Germany                
Loss Contingencies [Line Items]                
Area of leased property 5,100              
Leases expected to be delivered by October 2024 | Hallbergmoos, Germany                
Loss Contingencies [Line Items]                
Area of leased property           22,300    
Leases with first right of refusal for additional area | Hallbergmoos, Germany                
Loss Contingencies [Line Items]                
Area of leased property           13,400