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Restructuring Charge (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2017
Reduction in workforce, as a percent | 60.00% |  |  |
Restructuring expense | $ 100 |  |  |
Restructuring charges |  |  |  |
Restructuring charge | 50 | $ 1,052 | $ 676 |
Cash payments |  | (577) |  |
Balance at the end of the period | 475 | 475 |  |
Scenario, Forecast | Minimum |  |  |  |
Expected Cost Remaining |  |  |  | $ 200
Scenario, Forecast | Maximum |  |  |  |
Expected Cost Remaining |  |  |  | $ 300
Workforce reduction |  |  |  |
Restructuring charges |  |  |  |
Restructuring charge |  | 458 |  |
Cash payments |  | (458) |  |
Contractual obligations and other termination costs |  |  |  |
Restructuring charges |  |  |  |
Restructuring charge |  | 594 |  |
Cash payments |  | (119) |  |
Balance at the end of the period | $ 475 | $ 475 |  |

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