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Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Employee Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Amount expensed $ 79 $ 80 $ 237 $ 243
Discount from market price, percent     5.00%  
Restricted Stock Units (RSU)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Amount expensed $ 19 $ 9 $ 55 $ 24