15. Commitments and Contingencies

Collaborative Agreements, Royalties and Milestone Payments

The Company has committed to make potential future milestone payments and legal fees to third parties as part of licensing and development programs. Payments under these agreements become due and payable only upon the achievement of certain developmental, regulatory and commercial milestones by the Company’s licensees. Because it is uncertain if and when these milestones will be achieved, such contingencies, aggregating up to $7.6 million (assuming one product per contract meets all milestones events) have not been recorded on the accompanying consolidated balance sheets. The Company is unable to determine precisely when and if payment obligations under the agreements will become due as these obligations are based on milestone events, the achievement of which is subject to a significant number of risks and uncertainties.

Contingent Consideration

Pursuant to the Company’s royalty purchase agreements with Bioasis and Aronora, the Company has committed to pay the Bioasis Contingent Consideration, the Aronora Contingent Consideration and the Aronora Royalty Milestones. The Company recorded $0.1 million and $3.0 million for the Bioasis Contingent Consideration and the Aronora Contingent Consideration, respectively, which represent the estimated fair value of these potential future payments at the inception of the agreements. These contingent consideration payments are remeasured at fair value at each reporting period, with changes in fair value recorded in other income (expense), net. In September 2019, the Company paid the Aronora Contingent Consideration of $3.0 million. The liability for future Aronora Royalty Milestones will be recorded when the amounts by product are estimable and probable. As of December 31, 2019, none of these Aronora Royalty Milestones were assessed to be probable and as such, none was recorded on the consolidated balance sheet.