Quarterly report pursuant to Section 13 or 15(d)

Borrowing Arrangements - Additional Information (Detail)

v3.21.2
Borrowing Arrangements - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
May 21, 2020
Feb. 27, 2018
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]              
Loss on extinguishment of debt     $ 0 $ 0 $ 0 $ (1,237,000)  
Long-term debt, carrying value     35,300,000   35,300,000   $ 14,900,000
Perceptive              
Debt Instrument [Line Items]              
Credit Facility, principal payments         4,900,000    
Credit Facility, interest expense         4,900,000    
Exit fees and prepayment penalties     100,000   100,000    
Loss on extinguishment of debt         1,200,000    
Total debt     $ 0   $ 0   0
K2 Loan and Security Agreement              
Debt Instrument [Line Items]              
Loan and security agreement $ 45,000,000.0            
Interest rate     8.45%   8.45%    
Debt net     $ 2,500,000   $ 2,500,000    
Debt instrument, covenant compliance         The Company was in compliance with the debt covenants at September 30, 2021 and expects to be compliant with the debt covenants for the next twelve months.    
Total debt     35,000,000   $ 35,000,000   $ 15,000,000.0
Long-term debt, carrying value     $ 35,251,000   $ 35,251,000    
K2 Loan and Security Agreement | Tranche One              
Debt Instrument [Line Items]              
Loan and security agreement 15,000,000.0            
K2 Loan and Security Agreement | Tranche Two              
Debt Instrument [Line Items]              
Loan and security agreement 20,000,000.0            
Interest rate     0.20%   0.20%    
K2 Loan and Security Agreement | Tranche Three              
Debt Instrument [Line Items]              
Loan and security agreement $ 10,000,000.0            
K2 Loan and Security Agreement | Prime Rate              
Debt Instrument [Line Items]              
Interest rate     5.20%   5.20%    
Term Loan Facility | Perceptive              
Debt Instrument [Line Items]              
Maximum borrowing capacity under loan   $ 10,000,000.0          
Increase in applicable margin percentage on event of default   4.00%          
Period for which interest only payments will be made   24 months          
Credit Facility, principal payments   $ 200,000          
Deferred finance costs   500,000          
Debt issuance cost, net of discount   $ 1,500,000          
Number of shares issued for each warrant   190,000          
Warrant exercisable period   7 years          
Warrant exercise price   $ 9.5972          
Fair value of the warrant recorded as a debt discount   $ 1,500,000          
Term Loan Facility | Perceptive | LIBOR              
Debt Instrument [Line Items]              
Applicable margin percentage   11.00%          
Term Loan Facility | Perceptive | Term Loan Drawn on Effective Date of Credit Facility              
Debt Instrument [Line Items]              
Proceeds from initial term loan on closing date of Credit Facility   $ 5,000,000.0          
Term Loan Facility | Perceptive | Additional Term Loan Drawn Six Months Following Effective Date of Credit Facility              
Debt Instrument [Line Items]              
Remaining available amount from credit facility did not draw down   $ 5,000,000.0