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Related Party Transactions And Balances - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]      
Salary and benefits to employee $ 96 $ 84  
Outstanding loan balance repaid by employee 124    
Employee Relocation [Member]      
Related Party Transaction [Line Items]      
Relocation expense     $ 249
Grid Loan Agreement [Member]      
Related Party Transaction [Line Items]      
Loans receivable, related parties $ 3,385   $ 3,545
V F Hemp      
Related Party Transaction [Line Items]      
Debt securities maturity date Mar. 25, 2022    
Loan interest rate percentage 8.00%