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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Weighted Average Grant Date Fair Value [Abstract]      
Stock-based compensation expense $ 50 $ 8  
Restricted Stock [Member]      
Shares [Roll Forward]      
Nonvested balance at beginning of period (in shares) 13,689    
Issued (in shares) 16,661    
Vested (in shares) 0    
Forfeited (in shares) 0    
Nonvested balance at end of period (in shares) 30,350   13,689
Weighted Average Grant Date Fair Value [Abstract]      
Non-vested balance at beginning of period (in dollars per share) $ 27.51    
Issued (in dollars per share) 21.68    
Vested (in dollars per share) 0    
Forfeited (in dollars per share) 0    
Non-vested balance at end of period (in dollars per share) $ 24.31   $ 27.51
Weighted-average remaining vesting period for recognition 1 year 8 months 23 days    
Fair value of restricted stock granted $ 361    
Unrecognized stock-based compensation expense $ 501    
2016 Stock Incentive Plan [Member]      
Stock option plan activity [Abstract]      
Shares available for grant (in shares) 300,000    
ESPP [Member]      
Weighted Average Grant Date Fair Value [Abstract]      
Discount from market price at date of purchase 5.00%   5.00%
Total stock purchases under the plan (in shares) 862    
Shares reserved for issuance (in shares) 241,074    
ESPP [Member] | Minimum [Member]      
Weighted Average Grant Date Fair Value [Abstract]      
Discount from market price at date of purchase 0.00%    
ESPP [Member] | Maximum [Member]      
Weighted Average Grant Date Fair Value [Abstract]      
Discount from market price at date of purchase 15.00%