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Employee benefit-plans	12 Months Ended
Employee benefit-plans	Dec. 31, 2018
Employee benefit-plans
Employee benefit-plans	12. Employee benefit-plans The Company sponsors a 401(k) savings plan for our employees The Company may make discretionary contributions for each 401(k) plan year. During the year ended December 31, 2018 the Company made contributions of $0.1 million and during the year ended December 31, 2017 and 2016 did not make any contribution.