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Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
May 14, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2019
Debt Instrument [Line Items]        
Long-term debt   $ 25,000,000 $ 25,000,000 $ 25,000,000
Loan Agreement        
Debt Instrument [Line Items]        
Interest bearing rate upon customary events 4.00%      
Warrants expire term 10 years      
Warrants earlier termination date Sep. 30, 2020      
Aggregate repurchase price of warrants $ 500,000      
Fair value of warrant liabilities 400,000      
Interest expense   $ 600,000   $ 900,000
Term Loans        
Debt Instrument [Line Items]        
Aggregate amount of debt instrument 25,000,000      
Debt instrument, additional borrowing capacity amount $ 25,000,000      
Debt instrument, covenant description       Term Loan B is available through March 31, 2020, provided that (i) the Company has received at least $150.0 million of net cash proceeds in connection with the issuance and sale, subsequent to April 1 2019, of its equity securities and subordinated debt, (ii) the Company has initiated Phase 3 clinical trials for vonoprazan, and (iii) no event of default has occurred.
Debt instrument, interest rate percentage   7.25% 7.25% 7.25%
Debt instrument, description       The monthly payments consist of interest-only through June 1, 2021 or, in the event of positive data with respect to the Company’s Phase 3 clinical trial in both indications for vonoprazan sufficient to file an NDA with the FDA, through June 1, 2022.
Debt instrument maturity date May 01, 2024      
Debt instrument, final payment fee percentage 8.25%      
Debt instrument, final payment fee   $ 2,100,000 $ 2,100,000 $ 2,100,000
Debt issuance costs $ 200,000      
Long-term debt   25,000,000 25,000,000 25,000,000
Accrued interest   $ 200,000 200,000 $ 200,000
Term Loans | Prime Rate        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 1.75%      
Term Loans | Minimum        
Debt Instrument [Line Items]        
Threshold proceeds from issuance of equity securities and subordinated debt to borrow additional debt     $ 150,000,000  
Term Loans | Maximum        
Debt Instrument [Line Items]        
Debt instrument, prepayment fee percentage of outstanding principal amount 2.00%