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Subsequent events	12 Months Ended
Subsequent events	Dec. 31, 2019
Subsequent events
Subsequent events	15. Subsequent events The Company evaluated subsequent events through March 16, 2020, the date on which these financial statements were issued. On February 14, 2020, the Company entered into a seven-year lease agreement for 6,647 square feet of office space in South San Francisco, California. Under the agreement, the Company is required to make $2.3 million in minimum payments during the lease term. The Company anticipates that it will begin occupancy and commence the lease on or about June 1, 2020.