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Income Taxes (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Stock issued for services $ 1,730 $ 1,861
Accrued compensation 164 119
Stock issued for acquisition of program 1,202 1,576
Stock issued for license agreement 1,947 3,147
Stock issued for milestone payment 301 478
Amortizable license fee 6 9
Net operating loss carry-forward 40,248 50,517
Total gross deferred tax assets 45,598 57,707
Less: valuation allowance (45,598) (57,707)
Total net deferred tax assets $ 0 $ 0