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Stock Incentive Plan And Employee Stock Purchase Plan (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 93 Months Ended
Dec. 31, 2016
shares
Jan. 31, 2014
shares
Feb. 28, 2013
shares
Feb. 29, 2012
shares
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2018
USD ($)
item
shares
Jun. 30, 2017
USD ($)
shares
Dec. 31, 2017
shares
Dec. 31, 2015
shares
Jun. 30, 2018
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock compensation expense | $             $ 109 $ 51      
Shares issued under employee stock purchase plan, shares             1,663 1,830      
Stock Options [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock options granted 4,227 29,663 29,742 52,611     0   0 0  
Stock compensation expense | $         $ 1 $ 1 $ 2 $ 3      
Unrecognized compensation cost | $         $ 7   $ 7       $ 7
Unrecognized compensation cost, recognition period             1 year 5 months 19 days        
Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Awards granted         0 0 6,731 5,156     113,198
Restricted stock awards compensation expense | $         $ 43 $ 24 $ 107 $ 48      
Minimum [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period             3 years        
Maximum [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period             9 years        
Stock Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period             10 years        
Number of shares authorized         500,000   500,000       500,000
Shares available for issuance         270,559   270,559       270,559
Employee Stock Purchase Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares authorized         350,000   350,000       350,000
Minimum work hours per week | item             20        
Minimum months to be eligible to participate             5 months        
Purchase price for share percentage equal to fair value of such shares             95.00%        
Maximum discount to fair value percentage             15.00%        
Shares issued under employee stock purchase plan, shares             5,298        
Employee stock purchase plan, discount expense | $         $ 1 $ 1 $ 1 $ 1