3. Income Taxes (Details 1) - CHF (SFr) SFr in Thousands	Dec. 31, 2016	Dec. 31, 2015
Licenses capitalized for United States tax purposes	SFr 799	SFr 904
IPR&D basis difference	0	(770)
Stock options	255	181
Foreign tax credit carry over	243	243
Deferred tax asset, gross	28,217	25,315
Less valuation allowance for deferred tax asset	(28,217)	(25,315)
Net deferred tax asset	0	0
United States
Net operating loss carry forwards	25,841	23,857
Switzerland
Net operating loss carry forwards	896	900
The Netherlands
Net operating loss carry forwards	183	0
Luxembourg
Net operating loss carry forwards	SFr 0	SFr 0