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Equity Compensation Plans - Summary of stock option activity (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 01, 2016
May 31, 2016
May 20, 2014
Equity Compensation Plans          
Stock based compensation $ 1,641 $ 897      
2014 Plan          
Equity Compensation Plans          
Number of shares authorized     975,000 600,000 375,000
Number of shares issuable 169,791