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Stock-based Compensation - Compensation Cost Recognized for Stock Options and Restricted Stock Awards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Compensation cost recognized for the stock options and restricted stock awards [Abstract]    
Total compensation cost for share-based payment arrangements recognized in the statement of operations $ 753 $ 1,080