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Related Party Transactions - Narrative (Details)
$ in Millions
3 Months Ended
Sep. 16, 2019
USD ($)
installment
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Related Party Transaction [Line Items]        
Rent due from sublease agreement   $ 0.1    
Offset to rent expense from sublease agreement   $ 0.2 $ 0.2  
Number of stock options granted (in shares) | shares   1,358,500    
Weatherden Ltd        
Related Party Transaction [Line Items]        
Payment to related party   $ 0.2 $ 0.3  
Amounts due to related party   0.1   $ 0.1
VL46        
Related Party Transaction [Line Items]        
Rent due from sublease agreement   $ 0.9    
Consulting Agreement | Mr. Epstein        
Related Party Transaction [Line Items]        
Consulting arrangement term 1 year      
Termination notice period of consulting arrangement 30 days      
Termination notice period by non-breaching party in event of a breach 24 hours      
Number of stock options granted (in shares) | shares 75,000      
Number of equal monthly installments | installment 36      
Aggregate grant date fair value $ 0.2      
Aggregate annual cash consulting fee $ 0.3