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Income Taxes (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Stock issued for services $ 1,998 $ 1,730
Accrued compensation 38 164
Stock issued for acquisition of program 1,224 1,202
Stock issued for license agreement 1,760 1,947
Stock issued for milestone payment 278 301
Amortizable license fee 5 6
Net operating loss carry-forward 44,512 40,248
Total gross deferred tax assets 49,815 45,598
Less: valuation allowance (49,815) (45,598)
Total net deferred tax assets $ 0 $ 0