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Credit Facility (Details) - Revolving Credit Facility
 3 Months Ended
Mar. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]    
Aggregate credit agreement commitment $ 30,000,000  
Potential increase in borrowing capacity 20,000,000  
Potential maximum borrowing capacity $ 50,000,000  
Borrowing base, component, % of eligible accounts receivable 80.00%  
Borrowing base, component, % of eligible inventory 50.00%  
Borrowing base, allowable share of total commitment amount attributable to inventory component 50.00%  
Borrowing base, component, % of eligible equipment inventory 75.00%  
Borrowing base amount available $ 29,500,000  
Weighted average interest rate 3.75%  
Default trigger, certain defaults of other company indebtedness, amount $ 50,000  
Default trigger, rendering of certain judgments, amount 150,000  
Line of credit balance $ 417,000 $ 417,000
LIBOR Rate    
Line of Credit Facility [Line Items]    
Reference rate, number of allowable LIBOR-based borrowings outstanding | loan 3  
Variable rate, applicable margin 1.50%  
CB Floating Rate    
Line of Credit Facility [Line Items]    
Variable rate, applicable margin 1.50%  
Minimum    
Line of Credit Facility [Line Items]    
Minimum commitment coverage ratio allowed 2.00  
Maximum    
Line of Credit Facility [Line Items]    
Maximum leverage ratio allowed 2.50