XML 44 R33.htm IDEA: XBRL DOCUMENT v3.22.1
Long-Term Debt - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 01, 2021
Jun. 26, 2019
Jun. 06, 2017
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Debt Instrument [Line Items]                
Carrying value of long term debt           $ 17,891,000   $ 18,241,000
Repayments of long-term debt           375,000 $ 0  
Carrying value of debt excluding unamortized issuance costs           19,625,000    
Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 40,000,000              
Commitment fees incurred amount           $ 18,000    
Debt, weighted average interest rate           2.65%    
Credit Agreement | Secured Debt                
Debt Instrument [Line Items]                
Maximum borrowing capacity 20,000,000              
Outstanding debt           $ 19,625,000   20,000,000
Carrying value of debt excluding unamortized issuance costs           19,391,000   19,741,000
Credit Agreement | Revolving Credit Facility                
Debt Instrument [Line Items]                
Principal payment           $ 375,000    
Debt instrument subject to certain exceptions percentage           100.00%    
Credit Agreement | Revolving Credit Facility | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity 20,000,000              
Amount outstanding           $ 0   0
Credit Agreement | Letter of Credit | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity 5,000,000              
Amount outstanding           0   0
Credit Agreement | Bridge Loan | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 1,000,000              
Amount outstanding           $ 0   $ 0
Credit Agreement | Minimum | Revolving Credit Facility                
Debt Instrument [Line Items]                
Commitment fee on unused capacity           0.30%   0.30%
Credit Agreement | Maximum | Revolving Credit Facility                
Debt Instrument [Line Items]                
Commitment fee on unused capacity           0.45%   0.45%
Credit Agreement | Fed Funds Effective Rate Overnight Index Swap Rate | Minimum                
Debt Instrument [Line Items]                
Debt Instrument, variable interest rate           0.50%    
Credit Agreement | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Debt Instrument, variable interest rate           2.50%    
Debt instrument, interest rate, spread on effective percentage           2.00%    
Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum                
Debt Instrument [Line Items]                
Debt Instrument, variable interest rate           1.00%    
Credit Agreement | Base Rate                
Debt Instrument [Line Items]                
Debt Instrument, variable interest rate           1.50%    
Hercules Capital, Inc | Term Loan                
Debt Instrument [Line Items]                
Long-term debt, face amount     $ 35,000,000          
Debt instrument, effective interest rate             8.50%  
Prepayment fee percentage on principal loan prepaid 1.00%     1.00% 1.00%      
Prepayment of principal       $ 5,000,000 $ 15,000,000      
Carrying value of long term debt $ 20,000,000              
Debt prepayment fee 200,000              
Debt instrument, end of term fee 1,655,000              
Hercules Capital, Inc | Term Loan | Secured Debt                
Debt Instrument [Line Items]                
Repayments of long-term debt $ 20,000,000              
Hercules Capital, Inc | Term Loan | First Amendment                
Debt Instrument [Line Items]                
Long-term debt, face amount   $ 50,000,000            
Interest only period extension fee as a percentage of principal   0.50%            
Hercules Capital, Inc | Term Loan | Minimum                
Debt Instrument [Line Items]                
Prepayment fee percentage on principal loan prepaid   1.00%            
Hercules Capital, Inc | Term Loan | Maximum                
Debt Instrument [Line Items]                
Prepayment fee percentage on principal loan prepaid   3.00%            
Hercules Capital, Inc | Term Loan | Prime Based Variable Rate                
Debt Instrument [Line Items]                
Debt Instrument, variable interest rate     9.50%          
Hercules Capital, Inc | Tranche I Loan                
Debt Instrument [Line Items]                
Long-term debt, borrowed amount     $ 25,000,000          
Percentage of loan fee on original principal amount   4.25%            
Hercules Capital, Inc | Tranche II                
Debt Instrument [Line Items]                
Percentage of loan fee on original principal amount   3.95%            
Hercules Capital, Inc | Tranche II | First Amendment                
Debt Instrument [Line Items]                
Long-term debt, increase in face amount   $ 15,000,000            
Hercules Capital, Inc | Term Loan Tranche Three | Minimum | First Amendment                
Debt Instrument [Line Items]                
Debt instrument, available option to request additional advance amount   5,000,000            
Hercules Capital, Inc | Term Loan Tranche Three | Maximum | First Amendment                
Debt Instrument [Line Items]                
Debt instrument, available option to request additional advance amount   $ 10,000,000