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Income Taxes - Provision for income taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current: |  |  |
State | $ 5,010 | $ 486 | $ 2,700
Foreign | 1,303 | 1,171 | 482
Current provision for income taxes | 6,313 | 1,657 | 3,182
Deferred: |  |  |
State | 111 | (805) |
Foreign | (570) |  |
Deferred provision for income taxes | (459) | (805) |
Provision (benefit) for income taxes | $ 5,854 | $ 852 | $ 3,182

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