Commitments	3 Months Ended
Mar. 31, 2020
Commitments
Commitments	11. Commitments Lease Commitments The Company has an operating lease agreement for its office and laboratory space with AstraZeneca. See Note 5, Leases, for additional information. A Subscription Agreement In connection with the Company’s 2015 spin-out from AstraZeneca, the Company entered into a business transfer and subscription agreement with AstraZeneca pursuant to which the Company agreed to pay AstraZeneca a one‑time milestone payment of $5.0 million within three months of achieving a specified cumulative net sales milestone for durlobactam. This milestone payment will be automatically waived should the Company’s common stock trade on The Nasdaq Global Market at or above a specified price at any time prior to achieving such specified cumulative net sales milestone for durlobactam. The Company is also obligated to pay AstraZeneca a one‑time milestone payment of $10.0 million within two years of achieving the first commercial sale of zoliflodacin. At the Company’s election, either milestone payment may be paid in cash, common stock, or a combination of cash and common stock. Additionally, the Company is obligated to pay AstraZeneca tiered, single‑digit, per‑country royalties on the annual worldwide net sales of durlobactam and zoliflodacin.

11. Commitments

Lease Commitments

The Company has an operating lease agreement for its office and laboratory space with AstraZeneca. See Note 5, Leases, for additional information.

A Subscription Agreement

In connection with the Company’s 2015 spin-out from AstraZeneca, the Company entered into a business transfer and subscription agreement with AstraZeneca pursuant to which the Company agreed to pay AstraZeneca a one‑time milestone payment of $5.0 million within three months of achieving a specified cumulative net sales milestone for durlobactam. This milestone payment will be automatically waived should the Company’s common stock trade on The Nasdaq Global Market at or above a specified price at any time prior to achieving such specified cumulative net sales milestone for durlobactam. The Company is also obligated to pay AstraZeneca a one‑time milestone payment of $10.0 million within two years of achieving the first commercial sale of zoliflodacin. At the Company’s election, either milestone payment may be paid in cash, common stock, or a combination of cash and common stock. Additionally, the Company is obligated to pay AstraZeneca tiered, single‑digit, per‑country royalties on the annual worldwide net sales of durlobactam and zoliflodacin.