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Debt - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 30 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2021
Mar. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]          
Credit line borrowings $ 1,652 $ 1,652     $ 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 $ 1,700 1,700      
Unamortized debt issuance costs 100 $ 100      
Credit facility, interest rate   7.50%      
Available borrowing capacity remaining 300 $ 300      
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 $ 60 $ 60