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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Celgene (BMS) In connection with the Company's January 2019, September 2017 and January 2016 public offerings, BMS purchased 706,206, 745,592 and 800,000 shares of common stock, respectively. In connection with these and prior transactions, BMS owned 12.0% and 12.2% of the Company's fully diluted equity as of December 31, 2019 and 2018, respectively. During the years ended December 31, 2019, 2018 and 2017, all revenue recognized by the Company was recognized under the BMS collaboration agreement. Refer to Note 10 for additional information regarding these collaboration agreements.