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INCOME TAXES - Income tax provision (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Current: |  |
Federal | $ 0 | $ (631)
State | 0 | (62)
Total current income tax | 0 | (693)
Deferred: |  |
Federal | (1,383) | 275
State | (505) | (185)
Increase in valuation allowance | 2,518 | 261
Total deferred income tax | 630 | 351
Total income tax provision, amount | $ 630 | $ (342)

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