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Employee benefit plans	9 Months Ended
Employee benefit plans	Sep. 30, 2019
Employee benefit plans
Employee benefit plans	13. Employee benefit plans The Company sponsors a 401(k) savings plan for its employees. The Company may make discretionary contributions for each 401(k) plan year. During the three and nine months ended September 30, 2019, the Company made contributions of $0.1 million and $0.4 million, respectively. During the three and nine months ended September 30, 2018, the Company made contributions of less than $0.1 million.