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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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