4. Leases	6 Months Ended
Jun. 30, 2019
Leases [Abstract]
Leases	The facility lease agreement for Epalinges, Switzerland, is automatically renewed month by month with a notice period of three months. The related rent is paid monthly in the amount of E4 and is considered a short-term lease. The facility lease agreement for Leiden, The Netherlands, runs until March 31, 2020 and can be terminated with a six months' notice period. The related rent is paid monthly in the amount of E9. This lease is not considered short-term, however, the effect of recording the right to use asset and related liability are not material to the consolidated financial statements. The Company doesn't have any other operating lease for its research and development facilities, corporate headquarter, offices and equipment.

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-URI http://asc.fasb.org/topic&trid=2208923

Name:	us-gaap_LeasesOfLesseeDisclosureTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration