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INCOME TAXES (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets (liabilities): |  |
Net operating loss carryforwards | $ 122,678 | $ 83,656
Research and development credit | 15,217 | 10,491
Noncash compensation | 4,394 | 4,934
Other | 658 | 632
Deferred tax asset, excluding valuation allowance | 142,947 | 99,713
Less valuation allowance | (142,947) | (99,713)
Net deferred tax assets | $ 0 | $ 0

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