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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