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Commitments and Contingencies - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended
Feb. 28, 2019
USD ($)
ft²
renewal
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 31, 2018
USD ($)
ft²
Aug. 31, 2018
USD ($)
ft²
Operating Leased Assets [Line Items]          
Allowance for tenant improvements   $ 3,809      
Letter of credit   4,300 $ 4,300    
Cash paid for amounts included in measurement of lease liabilities   $ 1,400      
Weighted average discount rate, percent   8.34%      
Weighted average remaining lease term   10 years 8 months 12 days      
Non-cancellable purchase commitments   $ 5,300      
Newark          
Operating Leased Assets [Line Items]          
Operating lease term 188 months        
Allowance for tenant improvements $ 2,900        
Operating lease, option to extend term 10 years        
Area of operating lease | ft² 118,000        
Number of options to extend lease | renewal 2        
127 Months Lease Term          
Operating Leased Assets [Line Items]          
Area of office and laboratory | ft²         68,000
Operating lease term         127 months
Allowance for tenant improvements         $ 4,500
Operating lease, option to extend term         7 years
124 Months Lease Term          
Operating Leased Assets [Line Items]          
Area of office and laboratory | ft²       14,943  
Operating lease term       124 months  
Allowance for tenant improvements       $ 800  
Operating lease, option to extend term       7 years