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Sale of Royalties	12 Months Ended
Sale of Royalties	Dec. 31, 2019
Sale Of Royalties [Abstract]
Sale of Royalties	Sale of Royalties On December 13, 2016, the Company entered into the SWK Purchase Agreement with SWK pursuant to which the Company sold, and SWK purchased, the Company’s right to receive, commencing on October 1, 2016, certain Royalties (as defined in the SWK Purchase Agreement) arising from the sale by Adapt, pursuant to the Adapt Agreement of NARCAN®. As of December 31, 2017, all amounts due SWK under the SWK Purchase Agreement have been paid. SWK retains a 10% interest for all royalties and milestones that the Company received in the years ended December 31, 2019 and 2018, and will receive in future years.