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Stock-Based Compensation - Stock-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock-Based Compensation.        
Stock options $ 181 $ 133 $ 355 $ 264
Restricted stock units 68 50 130 119
Total stock-based compensation $ 249 $ 183 $ 485 $ 383