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Long-term Debt - Narrative (Details)
3 Months Ended 6 Months Ended
Sep. 12, 2019
USD ($)
installment
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Feb. 13, 2020
USD ($)
Warrants Expiring September 12, 2022            
Debt Instrument [Line Items]            
Number of shares called by warrants | shares 810,357          
Warrants exercise price (in USD per share) | $ / shares $ 6.72 $ 6.72   $ 6.72    
Senior Notes | Note Purchase Agreement            
Debt Instrument [Line Items]            
Debt maximum borrowing capacity $ 150,000,000          
Debt face amount $ 80,000,000          
Stated interest rate 10.75%          
Debt principal payments, number of installments | installment 8          
Debt upfront fee $ 1,125,000          
Loans, term 5 years          
Debt issuance costs $ 4,991,000          
Fair value of warrants $ 2,404,000          
Debt issuance costs, additional as percentage of principal amount 0.50%          
Prepayment fee, after second and before third anniversary 2.00%          
Prepayment fee, after third and before fourth anniversary 1.00%          
Prepayment premium amount $ 0          
Debt covenant, cash and cash equivalents 30,000,000          
Interest expense   $ 3,293,000 $ 2,389,000 $ 6,156,000 $ 4,777,000  
Senior Notes | Note Purchase Agreement - First Delayed Draw Notes            
Debt Instrument [Line Items]            
Debt face amount           $ 30,000,000
Fair value of warrants 150,000          
Senior Notes | Note Purchase Agreement - First Delayed Draw Notes | Quarter Ended December 31, 2019            
Debt Instrument [Line Items]            
Debt issuance criteria term, net sales and royalties benchmark 9,000,000          
Senior Notes | Note Purchase Agreement - Second Delayed Draw Notes            
Debt Instrument [Line Items]            
Debt face amount 20,000,000          
Senior Notes | Note Purchase Agreement - Third Delayed Draw Notes            
Debt Instrument [Line Items]            
Debt face amount 20,000,000          
Senior Notes | Note Purchase Agreement - Third Delayed Draw Notes | Quarter Ended September 30, 2020            
Debt Instrument [Line Items]            
Debt issuance criteria term, net sales and royalties benchmark 14,500,000          
Senior Notes | Note Purchase Agreement - Third Delayed Draw Notes | Six Months Ended December 31, 2020            
Debt Instrument [Line Items]            
Debt issuance criteria term, net sales and royalties benchmark $ 31,000,000