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Collaboration Agreements	3 Months Ended
Collaboration Agreements	Mar. 31, 2019
Collaboration Agreements [Abstract]
Collaboration Agreements	6. Collaboration Agreements Durect Corporation The Company had formerly entered into a Development and License Agreement (the “License Agreement”) with Durect Corporation around certain controlled-release technology. On March 20, 2019, the Company gave notice of termination to Durect Corporation for such License Agreement. This and other actions effectively ended the Company’s development of any product candidates related to such technology. There were no payments made to Durect Corporation during the three months ended March 31, 2019 and 2018.