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Debt - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 30 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2021
Mar. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]            
Credit line borrowings $ 1,323   $ 1,323     $ 2,219
Proceeds from issuance of subordinated convertible promissory notes     1,700      
Interest rate on convertible notes   5.00%        
Conversion rate (in dollars per share)         $ 0.67  
Revolving Credit Facility            
Line of Credit Facility [Line Items]            
Credit line borrowings 1,300   1,300      
Unamortized debt issuance costs 100   $ 100      
Credit facility, interest rate     7.25%      
Available borrowing capacity remaining 1,200   $ 1,200      
Line Of Credit Facility, Increase In Borrowing Capacity, Amount $ 500          
Line Of Credit Facility, Increase In Borrowing Capacity, Required Percent Of Net Realizable Value Of Eligible Inventory 50.00%          
Line Of Credit Facility, Increase In Borrowing Capacity, Required Amount Eligible Inventory $ 1,000          
Payments of Debt Issuance Costs 5          
Subsequent Event            
Line of Credit Facility [Line Items]            
Interest rate on convertible notes       10.00%    
Convertible Debt            
Line of Credit Facility [Line Items]            
Unamortized debt issuance costs $ 54   $ 54