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Equity Compensation Plans - Summary of stock option activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 31, 2016
Dec. 31, 2015
Summary Of Stock Option Activity [Abstract]          
Cash received from options exercised $ 33,000   $ 11,000    
Stock based compensation 2,257,000 $ 1,181,000 657,000    
Stock options          
Summary Of Stock Option Activity [Abstract]          
Intrinsic value of options exercised 27,000   3,000    
Cash received from options exercised 33,000   $ 11,000    
Tax benefit realized from option exercises $ 5,000        
Stock options | 2014 Plan          
Summary Of Stock Option Activity [Abstract]          
Number of shares authorized       975,000 375,000
Number of additional shares authorised in amendment       600,000  
Number of shares issuable 169,791