Annual report pursuant to Section 13 and 15(d)

Borrowing Arrangements - Additional Information (Detail)

v3.20.4
Borrowing Arrangements - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
May 21, 2020
Feb. 27, 2018
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]          
Loss on extinguishment of debt       $ (1,237,000) $ 0
Long-term debt, carrying value     $ 14,900,000 $ 14,900,000 3,700,000
K2 Loan and Security Agreement          
Debt Instrument [Line Items]          
Loan and security agreement $ 45,000.0        
Interest rate     8.45% 8.45%  
Debt net     $ 1,100 $ 1,100  
Debt instrument, covenant compliance       The Company was in compliance with the debt covenants at December 31, 2020 and expects to be compliant with the debt covenants for the next 12 months.  
Total debt     $ 15,000,000.0 $ 15,000,000.0 0.0
Tranche One | K2 Loan and Security Agreement          
Debt Instrument [Line Items]          
Loan and security agreement 15,000.0        
Tranche Two | K2 Loan and Security Agreement          
Debt Instrument [Line Items]          
Loan and security agreement 20,000.0        
Interest rate     0.20% 0.20%  
Tranche Three | K2 Loan and Security Agreement          
Debt Instrument [Line Items]          
Loan and security agreement $ 10,000.0        
Prime Rate | K2 Loan and Security Agreement          
Debt Instrument [Line Items]          
Interest rate     5.20% 5.20%  
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 $ 0.0 $ 5,000,000.0
Perceptive | Term Loan Facility          
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   $ 9.5792      
Fair value of the warrant recorded as a debt discount   $ 1,500,000      
Perceptive | Term Loan Facility | LIBOR          
Debt Instrument [Line Items]          
Applicable margin percentage   11.00%      
Perceptive | Term Loan Facility | 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      
Perceptive | Term Loan Facility | 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