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Debt -Summary (Details) - Loan Agreement - Term loan
1 Months Ended
Dec. 31, 2018
USD ($)
item
Debt  
Maximum borrowing capacity $ 75,000,000
Number of additional term loan advances | item 5
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 $ 5,000,000
Maximum value of lender option to purchase equity securities 2,000,000
Loan origination costs 1,290,000
Initial fee paid to lender $ 700,000
Prime rate  
Debt  
Variable rate basis prime rate of interest minus 5.50%
Variable interest rate margin (as a percent) 9.80%
Variable rate adjustment (as a percent) (5.50%)
Initial Advance  
Debt  
Principal amount of advances outstanding $ 25,000,000
Tranche 2 Advance  
Debt  
Maximum borrowing capacity 10,000,000
Tranche 3 Advance  
Debt  
Maximum borrowing capacity 5,000,000
Tranche 4 Advance  
Debt  
Maximum borrowing capacity 10,000,000
Tranche 5 Advance  
Debt  
Maximum borrowing capacity 15,000,000
Tranche 6 Advance  
Debt  
Maximum borrowing capacity 5,000,000
Tranche 7 Advance | Prime rate  
Debt  
Maximum borrowing capacity $ 5,000,000
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%