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Employee benefit plan	12 Months Ended
Employee benefit plan	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee benefit plan	Employee benefit plan The Company maintains a defined contribution 401(k) profit-sharing plan (the “401(k) Plan”) for eligible employees. Participants may make voluntary contributions up to the maximum amount allowable by law. The Company may make contributions to the 401(k) Plan on a discretionary basis which vest to the participants 100%. The Company made $0.2 million of matching contributions to the 401(k) Plan during the year ended December 31, 2018 and 2017, and $0.1 million during the year ended December 31, 2016.