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Related Party Transaction	3 Months Ended
Related Party Transaction	Mar. 31, 2020
Related Party Transactions [Abstract]
Related party transactions	Related Party Transactions Through the first quarter of 2019, the Company purchased certain research and development services from Genevant. These services were billed at agreed hourly rates and were reflective of market rates for such services. The total cost of these services for the three months ended March 31, 2019 was $33 thousand, which was included in the Condensed Consolidated Statement of Operations under research and development. There were no such costs incurred during 2020. Conversely, Genevant purchased certain administrative and transitional services from the Company totaling $19 thousand and $164 thousand for the three months ended March 31, 2020 and 2019, respectively, which were netted against research and development expenses in the condensed consolidated statements of operations. In addition, during 2019 Genevant had a sublease for 17,900 square feet in the Company’s Burnaby facility. Sublease income from Genevant was $0.1 million for the three months ended March 31, 2019, and was netted against site consolidation costs and lease liability. The Company’s Burnaby facility lease and the corresponding sublease to Genevant expired on July 31, 2019.