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Debt - Summary (Details) - Loan Agreement - Term loan
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Debt    
Maximum borrowing capacity   $ 75.0
Interest rate (as a percent) 9.80%  
Fee due at maturity, as a percentage of aggregate advances 6.95%  
The amount in excess of which prepayments may be made $ 5.0  
Maximum value of lender option to purchase equity securities $ 2.0  
Loan origination costs   2.1
Initial fee paid to lender   0.7
Prime rate    
Debt    
Variable rate basis interest minus 5.50%  
Variable interest rate margin (as a percent) 9.80%  
Variable rate adjustment (as a percent) (5.50%)  
Initial Advance    
Debt    
Maximum borrowing capacity   25.0
Principal amount of advances outstanding   $ 25.0
Additional term loan advances    
Debt    
Number of additional term loan advances | item 5  
Tranche 2 Advance    
Debt    
Maximum borrowing capacity $ 10.0  
Tranche 3 Advance    
Debt    
Maximum borrowing capacity 5.0  
Tranche 4 Advance    
Debt    
Maximum borrowing capacity 10.0  
Tranche 5 Advance    
Debt    
Maximum borrowing capacity 15.0  
Tranche 6 Advance    
Debt    
Maximum borrowing capacity 5.0  
Tranche 7 Advance    
Debt    
Maximum borrowing capacity $ 5.0  
Prepayment during the first 12 months following initial closing    
Debt    
Prepayment penalty as a percentage of the amount being repaid 3.00%  
Prepayment after the first 12 months following initial closing but before 24 months    
Debt    
Prepayment penalty as a percentage of the amount being repaid 2.00%  
Prepayment after the first 24 months following initial closing but before maturity    
Debt    
Prepayment penalty as a percentage of the amount being repaid 1.00%