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Basis of Presentation and Significant Accounting Policies - Liquidity (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 09, 2019
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Line Items]                      
Loss from operations   $ (102) $ (1,213) $ (1,378) $ (1,135) $ (1,905) $ (783) $ (248) $ (1,609) $ (3,828) $ (4,545)
Net cash provided by operating activities                   400 5,064
Debt, current   6,000               6,000  
Payable of related parties   $ 1,920       $ 0       $ 1,920 $ 0
Board of Directors Chairman                      
Accounting Policies [Line Items]                      
Consideration transferred $ 1,000