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Loss per Share - Computation of Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Numerator:    
Net loss $ (12,775) $ (9,888)
Denominator:    
Weighted-average common shares, basic 19,896 18,942
Incremental dilutive shares 0 0
Weighted-average common shares, diluted 19,896 18,942
Net loss per share, basic and diluted $ (0.64) $ (0.52)
Warrant [Member]    
Denominator:    
Dilutive effect 0 0
Employee Stock Option [Member]    
Denominator:    
Dilutive effect 0 0