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Employee benefit-plans	12 Months Ended
Employee benefit-plans	Dec. 31, 2019
Employee benefit plans
Employee benefit plans	14. Employee benefit-plans The Company sponsors a 401(k) savings plan for employees. The Company may make discretionary contributions for each 401(k) plan year. During the years ended December 31, 2019 and 2018 the Company made contributions of $0.5 million and $0.1 million, respectively. During the year ended December 31, 2017, the Company did not make any contributions.