Annual report pursuant to Section 13 and 15(d)

Notes payable, net - Additional Information (Details)

v3.20.4
Notes payable, net - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 29, 2020
Apr. 20, 2020
Aug. 30, 2020
Dec. 31, 2016
Dec. 31, 2020
Dec. 31, 2019
Aug. 31, 2020
Debt Instrument [Line Items]              
Interest rate         8.49%    
Payment of remaining balance of long-term debt         $ 1,512,000 $ 0  
Note payable, net         1,989,000    
Cash         12,862,000 $ 10,872,000  
Unsecured debt              
Debt Instrument [Line Items]              
prime rate   1.00%          
Note payable, net         1,086,000    
Face amount   $ 1,086,000          
Debt term   2 years          
Loan agreement              
Debt Instrument [Line Items]              
Borrowing capacity       $ 7,000,000      
Variable rate       5.41%      
Deferral principal payment period 3 months            
PWB loan agreement | Term loans              
Debt Instrument [Line Items]              
Borrowing capacity         $ 2,000,000   $ 2,000
Interest rate         4.64%    
prime rate             4.50%
Available for corporate purposes         $ 480,000    
Note payable, net         $ 2,000    
PWB loan agreement | Prime rate | Term loans              
Debt Instrument [Line Items]              
Variable rate     0.50%