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Debt - Additional Information (Detail)
3 Months Ended
Jul. 02, 2019
USD ($)
$ / shares
shares
Mar. 31, 2022
USD ($)
Payment
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]        
Debt instrument, effective rate   11.34%    
Interest expense   $ 218,000 $ 271,000  
Oxford Finance LLC And Horizon Technology Finance Corporation [Member] | Term Loan [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 20,000,000      
Proceeds from term loan $ 10,000,000      
Extended borrowing capacity     $ 10,000,000 $ 10,000,000
Interest rate description   The outstanding loan balance will accrue interest at the greater of (i) the rate of the one-month U.S. LIBOR rate plus 6.25% and (ii) 8.75%. The Loan Agreement provides for an interest only period until July 1, 2021, followed by thirty-six equal monthly payments of principal and interest continuing through June 1, 2024 (the “Maturity Date”).    
Number of monthly payments | Payment   36    
Debt instruments maturity date   Jun. 01, 2024    
Debt instrument, effective rate 4.50%      
Debt instrument, interest rate, stated percentage 8.75%      
Term loan event of default description   Events of default include, among other things, the Company’s failure to pay amounts due, a breach of certain covenants, a material adverse change event, misrepresentations and judgments.    
Term loan default interest rate 5.00%      
Oxford Finance LLC And Horizon Technology Finance Corporation [Member] | Term Loan [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Debt instrument, percentage of pre payment fees 1.00%      
Oxford Finance LLC And Horizon Technology Finance Corporation [Member] | Term Loan [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt instrument, percentage of pre payment fees 3.00%      
Oxford Finance LLC And Horizon Technology Finance Corporation [Member] | Term Loan [Member] | LIBOR [Member]        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 6.25%      
Oxford Finance LLC And Horizon Technology Finance Corporation [Member] | Term A Loan [Member]        
Debt Instrument [Line Items]        
Debt Issuance Costs $ 150,000      
Number of securities called by warrants | shares 15,686      
Exercise price of warrants | $ / shares $ 12.75      
Warrants maximum contractual term 10 years      
Warrant, fair value $ 136,000