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INCOME TAXES - Reconciliation of income tax provision relative to continuing operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Federal income tax benefit at U.S. statutory rate | 21.00% | 34.00%
State taxes, net of federal benefit | 13.20% | 8.70%
Change in valuation allowance, exclusive of Tax Reform impact | (44.00%) | (57.50%)
Effect of Tax Reform on net deferred taxes | 0.00% | 17.20%
Permanent differences | (6.30%) | (1.70%)
Credits | 3.70% | 2.20%
Other | 0.20% | 0.00%
Total income tax provision, percent | (12.20%) | 2.90%
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Federal income tax benefit at U.S. statutory rate | $ (817) | $ (1,760)
State taxes, net of federal benefit | (515) | (452)
Change in valuation allowance, exclusive of Tax Reform impact | 1,714 | 2,979
Effect of Tax Reform on net deferred taxes | 0 | (890)
Permanent differences | 247 | 91
Credits | (146) | (116)
Other | (7) | (2)
Total income tax provision, amount | $ 476 | $ (150)

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