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Debt (Details)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
Dec. 31, 2020
instrument
Dec. 31, 2020
item
Dec. 31, 2019
USD ($)
DEBT              
Finance lease     $ 98,000       $ 2,412,000
Dominion Loan Agreement              
DEBT              
Maturity of line of credit extended 1 year            
Maximum borrowing capacity $ 15,000,000 $ 15,000,000          
Percentage of maximum borrowing capacity on eligible accounts receivable 80.00%            
Percentage of maximum borrowing capacity on deposit with lender 100.00%            
Restricted CDARS account $ 5,000,000            
Commitment fee (as a percent)   0.10%          
Minimum tangible net worth   $ 75,000,000          
Dominion Loan Agreement | Minimum              
DEBT              
Interest rate (as a percent)   3.50%          
Dominion Loan Agreement | Maximum              
DEBT              
Interest rate (as a percent)   6.00%          
Dominion Letters of Credit              
DEBT              
Number of letters of credit       1   1  
Amount of letter of credit     583,000        
Notes payable to finance companies for insurance              
DEBT              
Interest rate (as a percent)       4.99%      
Number of notes payable | instrument         1    
Total insurance premiums     $ 40,000        
Notes payable to finance companies for insurance | Minimum              
DEBT              
Interest rate (as a percent)             4.05%
Notes payable to finance companies for insurance | Maximum              
DEBT              
Interest rate (as a percent)             4.99%