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Debt - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended
Apr. 06, 2022
USD ($)
Jul. 06, 2021
USD ($)
Aug. 13, 2020
USD ($)
Installment
Oct. 31, 2021
PrivatePlacement
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Oct. 31, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Aug. 31, 2020
USD ($)
Private Placement [Member]                      
Number of private placements | PrivatePlacement       2              
SVB Term Loan [Member]                      
Debt instrument, principal amount     $ 14,000   $ 11,667     $ 11,667   $ 14,000  
Interest-only payment period     24 months                
Loan payment, number of consecutive equal monthly installments of principal including accrued interest | Installment     24                
Debt instrument, maturity date               Feb. 01, 2024      
Debt instrument, final payment fee amount     $ 1,200   1,200     $ 1,200      
Debt default additional interest charge     5.00%                
Debt finance costs   $ 68                 $ 57
Amortization of deferred financing charges         20 $ 5   37 $ 11    
Unamortized deferred charges         60     60   76  
Financing costs paid                     $ 27
Accretion loan discounts         2 2   5 5    
Loan discounts-financing costs         7     7   12  
Accrual of the final payment fee         104 119   220 237    
Debt instrument, accrued final payment fee         877     $ 877   657  
Contingent interest rate increase               2.00%      
Amortization of term loan         16 $ 19   $ 35 $ 37    
Term loan discount interest         $ 49     $ 49   $ 84  
Weighted average interest rate, floating         4.92% 4.25%   4.59% 4.25%    
SVB Term Loan [Member] | Term Loan Derivative Liability [Member]                      
Term loan derivative liability     $ 187                
SVB Term Loan [Member] | Term Loan Derivative Liability [Member] | Contingent Interest Rate Increase [Member]                      
Derivative liability, measurement input         0.0200     0.0200      
SVB Term Loan [Member] | Term Loan Derivative Liability [Member] | Discount Rate [Member]                      
Derivative liability, measurement input         0.120     0.120      
SVB Term Loan [Member] | Minimum [Member]                      
Interest rate, floating     4.25%                
Long term debt percentage bearing adjusted floating interest rate     6.25%                
SVB Term Loan [Member] | First Amendment                      
Debt instruments percentage of required to deposit unrestricted and unencumbered cash collateral   100.00%                  
Equity raise requirements, description               if the Company failed to receive positive data in its Phase 2b/3 PRISM trial or to raise by June 30, 2022 sufficient net proceeds from the sale of equity securities to finance its planned second Phase 3 clinical trial of Haduvio for prurigo nodularis and its ongoing operations (each a “Milestone Condition”), the Company would be required to deposit unrestricted and unencumbered cash equal to 100% of all outstanding amounts owed to SVB in a cash collateral account with SVB, which could be used by SVB to prepay the SVB Term Loan at any time.      
SVB Term Loan [Member] | First Amendment | Minimum [Member]                      
Proceeds from the sale of equity securities             $ 15,000        
Debt instruments amount of required to maintain unrestricted and unencumbered cash   $ 20,000                  
SVB Term Loan [Member] | Third Amendment [Member]                      
Proceeds from the sale of equity securities $ 45,000                    
Debt finance costs         $ 21     $ 21      
SVB Term Loan [Member] | Third Amendment [Member] | Term Loan Derivative Liability [Member]                      
Term loan derivative liability         $ 136     $ 136      
SVB Term Loan [Member] | Third Amendment [Member] | Minimum [Member]                      
Interest rate, floating 4.25%                    
Long term debt percentage bearing adjusted floating interest rate 6.25%                    
SVB Term Loan [Member] | Prepayment Prior to First Anniversary of Effective Date [Member]                      
Prepayment premium percentage on principal amount     3.00%                
SVB Term Loan [Member] | Prepayment After First Anniversary of Effective Date and Prior To Second Anniversary of Effective Date [Member]                      
Prepayment premium percentage on principal amount     2.00%                
SVB Term Loan [Member] | Prepayment After Second Anniversary of the Effective Date and Prior to February 1, 2024 [Member]                      
Prepayment premium percentage on principal amount     1.00%                
SVB Term Loan [Member] | Prime Rate [Member]                      
Variable interest rate     1.00%                
SVB Term Loan [Member] | Prime Rate [Member] | Third Amendment [Member]                      
Variable interest rate 1.00%                    
SVB Term Loan [Member] | Adjusted Prime Rate [Member]                      
Variable interest rate     3.00%                
SVB Term Loan [Member] | Adjusted Prime Rate [Member] | Third Amendment [Member]                      
Variable interest rate 3.00%