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Leases - Additional Information (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2019
Feb. 28, 2015
ft²
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Lessee Lease Description [Line Items]            
Area of office space | ft²   31,280        
Lease expiration date   Nov. 30, 2027        
Operating lease, existence of option to extend   true        
Operating lease, option to extend         an option to extend the term for a period of three years  
Operating lease option to extend term     3 years   3 years  
Operating lease cost     $ 0.6 $ 0.3 $ 1.6 $ 0.8
Operating leases, weighted-average remaining lease term     6 years 7 months 6 days   6 years 7 months 6 days  
Operating leases, weighted-average discount rate     10.70%   10.70%  
Cash paid for operating lease liabilities         $ 1.2 0.8
Right-of-use assets obtained in exchange for new operating lease liabilities         $ 9.8 $ 2.8
Co-located Data Center Space            
Lessee Lease Description [Line Items]            
Lease expiration date Aug. 31, 2022          
Operating lease, existence of option to extend true          
Operating lease, option to extend         an option to extend the term for a period of three years  
Operating lease option to extend term 3 years