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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Stock-based compensation costs included in: |  |
Total stock-based compensation expense | $ 64 | $ 71
Costs of Sales [Member] |  |
Stock-based compensation costs included in: |  |
Total stock-based compensation expense | (6) | 2
Sales and marketing expense [Member] |  |
Stock-based compensation costs included in: |  |
Total stock-based compensation expense | 6 | 19
General and administrative expense [Member] |  |
Stock-based compensation costs included in: |  |
Total stock-based compensation expense | $ 64 | $ 50

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