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Income Taxes - Components (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
U.S. federal | $ 0 | $ 1 | $ 123
State | 10 | 26 | 26
Total current | 10 | 27 | 149
Deferred: |  |  |
U.S. Federal | (125) | 0 | 0
State | 0 | 0 | 0
Total deferred | (125) | 0 | 0
Provision for income taxes | $ (115) | $ 27 | $ 149

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