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Commitments and Contingent Liabilities (Details Textual) - USD ($)
12 Months Ended
Mar. 31, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Commitments [Line Items]        
Operating leases, rent expense   $ 7,000 $ 4,000 $ 3,000
Deferred rent credit, current   1,000 1,000  
Deferred rent credit, noncurrent   $ 4,000 $ 5,000  
Promissory Note        
Other Commitments [Line Items]        
Maximum borrowing capacity $ 7,000,000      
Basis spread on variable rate 0.05%      
Interest rate at period end   5.55%    
Long-term line of credit   $ 0    
Promissory Note | Minimum        
Other Commitments [Line Items]        
Debt instrument, interest rate, effective percentage 4.10%