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Related Party Transactions and Balances - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]      
Salary and benefits to employee $ 118 $ 110 $ 115
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 $ 3,545 10,865  
VF Hemp [Member]      
Related Party Transaction [Line Items]      
Debt securities maturity date Mar. 25, 2022    
Loan interest rate percentage 8.00%    
Loan wrote off $ 3,791 3,545  
AVGG Hemp [Member]      
Related Party Transaction [Line Items]      
Loan interest rate percentage 8.00%    
Loans receivable, related parties $ 5,000    
Loan wrote off   1,184  
Grid loan to joint venture   $ 1,184