Commitments	9 Months Ended
Sep. 30, 2019
Commitments
Commitments	11. Commitments License agreements Through September 30, 2019, the Company had licensed intellectual property from two biotechnology companies. The consideration included upfront payments and a commitment to pay annual license fees, milestone payments and, upon product commercialization, royalties on revenue generated from the sale of products covered by the licenses. The Company recorded a milestone payment of $600 during the three and nine months ended September 30, 2019 upon dosing of the first patient in the expansion cohort of the XMT-1536 clinical trial. The Company did not record any milestone payments during the nine months ended September 30, 2018.

Commitments

9 Months Ended

Sep. 30, 2019

11. Commitments

License agreements

Through September 30, 2019, the Company had licensed intellectual property from two biotechnology companies. The consideration included upfront payments and a commitment to pay annual license fees, milestone payments and, upon product commercialization, royalties on revenue generated from the sale of products covered by the licenses. The Company recorded a milestone payment of $600 during the three and nine months ended September 30, 2019 upon dosing of the first patient in the expansion cohort of the XMT-1536 clinical trial. The Company did not record any milestone payments during the nine months ended September 30, 2018.