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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

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