Quarterly report pursuant to Section 13 or 15(d)

Leases - Narrative (Details)

v3.20.1
Leases - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended
Aug. 31, 2015
ft²
Mar. 31, 2020
USD ($)
ft²
extension_option
lease_agreement
Feb. 29, 2020
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]        
Lease Liabilities | $   $ 0.3    
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 | extension_option   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_agreement   3    
Leases Expected to be Delivered by February 2020 | Hallbergmoos, Germany        
Loss Contingencies [Line Items]        
Area of leased property   96,400    
Leases Expected to be Delivered by May 2020 | Hallbergmoos, Germany        
Loss Contingencies [Line Items]        
Area of leased property   8,600    
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