Related-party Transactions

12 Months Ended

Dec. 31, 2019

Related Party Transactions [Abstract]

Related-party Transactions

Related-party Transactions

In July 2019, the Company entered into the Celgene License Agreement under which it received a non-refundable upfront payment of $50.0 million from Celgene. Previously, in July 2016, the Company entered into the Celgene Collaboration Agreement and a Series B-1 Preferred Stock Purchase Agreement with Celgene. Under the Celgene Collaboration Agreement, the Company received a non-refundable upfront payment of $225.0 million. Under the Series B-1 Preferred Stock Purchase Agreement, Celgene purchased 10,448,100 shares of Series B-1 Preferred Stock for $36.1 million. These shares of Series B-1 Preferred Stock converted into 2,831,463 shares of common stock upon the completion of the Company’s IPO. In addition, an affiliate of Celgene purchased 625,000 shares of the Company’s common stock in the IPO at the public offering price of $16.00 per share for a total of $10.0 million. As of December 31, 2019, the Company had recorded $0.7 million of reimbursable expenses due from Celgene within prepaid expenses and other current assets in the accompanying consolidated balance sheets. No amounts were due to or from Celgene as of December 31, 2018.

As discussed within Note 3, “Celgene Agreements”, BMS completed its acquisition of Celgene in November 2019, and Celgene is now a wholly-owned subsidiary of BMS.