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Revenue Recognition - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Mar. 01, 2020
Feb. 01, 2019
Disaggregation Of Revenue [Line Items]      
Revenue remaining unsatisfied performance obligation $ 0    
Payment term for customers 120 days    
Subsequent Event      
Disaggregation Of Revenue [Line Items]      
Maximum amount of reduction in monthly co-payments of each prescription   $ 100  
Maximum      
Disaggregation Of Revenue [Line Items]      
Amount of reduction patients could receive from cost of co-payments of first month of therapy     $ 300
Amount of reduction from the cost of each refill for maximum of 12 months     $ 250