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INCOME TAXES - Operating Loss Carryforwards, Summary of Deferred Taxes and Temporary Tax Differences (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Noncurrent deferred income tax assets: |  |
Net operating loss carryforwards | $ 63,906 | $ 56,619
Intangible assets | 7,261 | 6,889
Accrual and reserves | 2,502 | 2,402
Other | 19 | 88
Total noncurrent deferred tax assets | 73,688 | 65,998
Valuation allowance | (73,129) | (66,491)
Noncurrent deferred tax assets, net of valuation allowance | 559 |
Noncurrent deferred income tax liabilities: |  |
Noncurrent deferred tax assets, net of valuation allowance |  | (493)
Fixed assets | 593 |
Fixed assets |  | (152)
Total noncurrent deferred tax liabilities |  | (152)
Total noncurrent deferred tax liabilities | 593 |
Net deferred income tax liability | (34) | (341)
Reconciliation of the valuation allowances |  |
Valuation allowance at the beginning of the period | (66,491) |
Gross increase for current year activity | (6,638) | 37,132
Valuation allowance at the end of the period | (73,129) | $ (66,491)
Federal |  |
Operating loss carryforwards |  |
Net operating loss carryforwards | 248,717 |
State |  |
Operating loss carryforwards |  |
Net operating loss carryforwards | $ 228,787 |

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