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Leases - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
ft²
operating_lease
Term
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Lessee, Lease, Description [Line Items]        
2020 $ 5,997      
Number of operating leases | operating_lease 3      
Term of Contract ( in years ) 15 years      
Rent expense $ 6,000 $ 2,700 $ 2,200  
Area of real estate property | ft² 185,000      
Weighted-average remaining lease terms - operating leases (years) 3 years 4 months 17 days      
Operating lease ROU asset $ 13,693     $ 11,300
Lease not yet commenced | operating_lease 1      
Total $ 14,171     $ 11,300
Renewal Term ( in years ) 10 years      
Aggregate rent, Initial term $ 15,983      
Percent of market rate 95.00%      
2021 $ 4,144      
2022 $ 2,465      
Minimum        
Lessee, Lease, Description [Line Items]        
Term of Contract ( in years ) 1 month 6 days      
Maximum        
Lessee, Lease, Description [Line Items]        
Term of Contract ( in years ) 6 years 6 months      
New Building        
Lessee, Lease, Description [Line Items]        
Number of terms | Term 2      
Renewal Term ( in years ) 10 years      
The Campus        
Lessee, Lease, Description [Line Items]        
Aggregate rent, Initial term $ 88,100      
BioElectron        
Lessee, Lease, Description [Line Items]        
2020 1,800      
2021 1,800      
2022 $ 1,400