Related Party Transactions	9 Months Ended
Sep. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	2. Related Party Transactions Frazier is a principal stockholder of the Company and is represented on the Company’s board of directors. For the year ended December 31, 2018 and the nine months ended September 30, 2019, the Company conducted its operations within office space controlled by Frazier and Frazier allocated a portion of the costs associated with this office to the Company. In addition, Frazier paid for various goods and services, such as employee wages, insurance and expense reimbursements and various administrative services associated with the operations of the Company and charged the Company for those expenses. As of September 30, 2019, and December 31, 2018, the Company had outstanding accounts payable balances due to Frazier of $71,000 and $45,000, respectively, related to these shared operating expenses. For the three months ended September 30, 2019 and 2018, the Company incurred $0.2 million and $66,000, respectively, of shared operating expenses. For the nine months ended September 30, 2019 and 2018, the Company incurred $0.3 million and $0.2 million, respectively, of shared operating expenses. In addition to the shared operating expenses, the Company issued convertible promissory notes to Frazier during 2018 and 2019 (see Note 4). Frazier is a principal stockholder in PCI Pharma Services (“PCI”). In the third quarter of 2019, the Company engaged PCI for clinical manufacturing services. As of September 30, 2019, the Company had $0.1 million in prepaid services and $0.2 million outstanding accounts payable and accrued expenses related to these manufacturing services. For the three and nine months ended September 30, 2019, the Company incurred $0.2 million of expenses related to services performed by PCI. Mountain Field LLC (“Mountain Field”) is an entity owned by the chairman of the Company’s board of directors. During the year ended December 31, 2018 and the nine months ended September 30, 2019, the Company charged Mountain Field for certain rent and payroll related expenses. These shared expenses were allocated based on usage of the related facilities and time incurred by personnel. As of September 30, 2019, and December 31, 2018, the Company had an outstanding accounts receivable balance from Mountain Field of $0 and $19,000, respectively, related to shared operating expenses. For the three months ended September 30, 2019 and 2018, the Company incurred $0 and $5,000, respectively, for shared expenses. For the nine months ended September 30, 2019 and 2018, the Company charged Mountain Field $0.1 million and $2,000, respectively, for shared expenses. Takeda became a common stockholder of the Company as of May 7, 2019 in connection with the May 2019 license agreement (see Note 3).

Related Party Transactions

9 Months Ended

Sep. 30, 2019

2. Related Party Transactions

Frazier is a principal stockholder of the Company and is represented on the Company’s board of directors. For the year ended December 31, 2018 and the nine months ended September 30, 2019, the Company conducted its operations within office space controlled by Frazier and Frazier allocated a portion of the costs associated with this office to the Company. In addition, Frazier paid for various goods and services, such as employee wages, insurance and expense reimbursements and various administrative services associated with the operations of the Company and charged the Company for those expenses. As of September 30, 2019, and December 31, 2018, the Company had outstanding accounts payable balances due to Frazier of $71,000 and $45,000, respectively, related to these shared operating expenses. For the three months ended September 30, 2019 and 2018, the Company incurred $0.2 million and $66,000, respectively, of shared operating expenses. For the nine months ended September 30, 2019 and 2018, the Company incurred $0.3 million and $0.2 million, respectively, of shared operating expenses. In addition to the shared operating expenses, the Company issued convertible promissory notes to Frazier during 2018 and 2019 (see Note 4).

Frazier is a principal stockholder in PCI Pharma Services (“PCI”). In the third quarter of 2019, the Company engaged PCI for clinical manufacturing services. As of September 30, 2019, the Company had $0.1 million in prepaid services and $0.2 million outstanding accounts payable and accrued expenses related to these manufacturing services. For the three and nine months ended September 30, 2019, the Company incurred $0.2 million of expenses related to services performed by PCI.

Mountain Field LLC (“Mountain Field”) is an entity owned by the chairman of the Company’s board of directors. During the year ended December 31, 2018 and the nine months ended September 30, 2019, the Company charged Mountain Field for certain rent and payroll related expenses. These shared expenses were allocated based on usage of the related facilities and time incurred by personnel. As of September 30, 2019, and December 31, 2018, the Company had an outstanding accounts receivable balance from Mountain Field of $0 and $19,000, respectively, related to shared operating expenses. For the three months ended September 30, 2019 and 2018, the Company incurred $0 and $5,000, respectively, for shared expenses. For the nine months ended September 30, 2019 and 2018, the Company charged Mountain Field $0.1 million and $2,000, respectively, for shared expenses.

Takeda became a common stockholder of the Company as of May 7, 2019 in connection with the May 2019 license agreement (see Note 3).