Collaboration Agreements (Details1) - Neurocrine Collaboration Agreement [Member] - Neurocrine Biosciences [Member] - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01	Dec. 31, 2019
Exclusive License to XEN901 and Exclusive License to DTCs [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue remaining performance obligation excepted period	10 months
Development Services Under the Initial Development Program For DTCs [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Revenue remaining performance obligation excepted period	15 months