License Fee Payable	12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]
License Fee Payable	License Fee Payable On February 28, 2018, the Company was notified that Adapt, a Subsidiary of Emergent BioSolutions ("EBS"), had entered into a license agreement with a Third Party (as defined in the License Agreement) with regard to one or more patents pursuant to which Adapt invoked its right under Section 5.5 of the License Agreement, dated as of December 15, 2014, by and between the Company and Adapt, as amended (the "License Agreement"), to offset 50% of certain payments paid to such Third Party from the amounts payable by Adapt to the Company under the License Agreement and SWK under the SWK Purchase Agreement. On March 1, 2018, the Company received net milestone payments of $6.1 million, which was net of 50% of a license fee payment Adapt made to the Third Party. Adapt reduced such milestone payment by $6.25 million pursuant to Section 5.5 of the License Agreement. The portion of the milestone payment that the Company would have otherwise received was reduced by $5.6 million. As provided in Amendment No. 2 to the License Agreement, which the parties entered into on March 18, 2019 (see Note 17, Subsequent Events), Adapt has made has made and will in the future make payments to the Third Party Licensee and will be allowed to reduce the royalties and milestones that the Company would be due under the License Agreement by a maximum of $9.0 million in relation to such payments. Under the SWK Purchase Agreement, the Company retains 90% of the royalties payable under the License Agreement, with SWK entitled to 10%. The maximum amount payable by the Company is therefore $8.1 million (90% of $9 million), of which the Company has recorded $5.4 million as a current liability and $2.7 million as a long-term liability at December 31, 2018. As provided in Amendment No. 2, Adapt will be allowed to reduce the royalties and milestones that the Company would be due under the License Agreement during the year ended December 31, 2019 by a maximum of $1.8 million each quarter. As provided in the License Agreement, if Net NARCAN® Sales (as defined in the License Agreement) exceed $200 million in any calendar year, the Company and SWK will be due a milestone of $15.0 million. Under Amendment No. 2, if this $15.0 million milestone becomes payable to the Company and SWK, Adapt may deduct $2.7 million from the $13.5 million (90% of $15.0 million) milestone payable to the Company. As of December 31, 2019, the Company has paid the amount payable of $8.1 million as net sales of NARCAN® exceeded $200 million during the nine months ended September 30, 2019. Accordingly, as of December 31, 2019 no further payments are due related to the License Fee Payable.

License Fee Payable

On February 28, 2018, the Company was notified that Adapt, a Subsidiary of Emergent BioSolutions ("EBS"), had entered into a license agreement with a Third Party (as defined in the License Agreement) with regard to one or more patents pursuant to which Adapt invoked its right under Section 5.5 of the License Agreement, dated as of December 15, 2014, by and between the Company and Adapt, as amended (the "License Agreement"), to offset 50% of certain payments paid to such Third Party from the amounts payable by Adapt to the Company under the License Agreement and SWK under the SWK Purchase Agreement. On March 1, 2018, the Company received net milestone payments of $6.1 million, which was net of 50% of a license fee payment Adapt made to the Third Party. Adapt reduced such milestone payment by $6.25 million pursuant to Section 5.5 of the License Agreement. The portion of the milestone payment that the Company would have otherwise received was reduced by $5.6 million.

As provided in Amendment No. 2 to the License Agreement, which the parties entered into on March 18, 2019 (see Note 17, Subsequent Events), Adapt has made has made and will in the future make payments to the Third Party Licensee and will be allowed to reduce the royalties and milestones that the Company would be due under the License Agreement by a maximum of $9.0 million in relation to such payments. Under the SWK Purchase Agreement, the Company retains 90% of the royalties payable under the License Agreement, with SWK entitled to 10%. The maximum amount payable by the Company is therefore $8.1 million (90% of $9 million), of which the Company has recorded $5.4 million as a current liability and $2.7 million as a long-term liability at December 31, 2018. As provided in Amendment No. 2, Adapt will be allowed to reduce the royalties and milestones that the Company would be due under the License Agreement during the year ended December 31, 2019 by a maximum of $1.8 million each quarter. As provided in the License Agreement, if Net NARCAN® Sales (as defined in the License Agreement) exceed $200 million in any calendar year, the Company and SWK will be due a milestone of $15.0 million. Under Amendment No. 2, if this $15.0 million milestone becomes payable to the Company and SWK, Adapt may deduct $2.7 million from the $13.5 million (90% of $15.0 million) milestone payable to the Company.

As of December 31, 2019, the Company has paid the amount payable of $8.1 million as net sales of NARCAN® exceeded $200 million during the nine months ended September 30, 2019. Accordingly, as of December 31, 2019 no further payments are due related to the License Fee Payable.