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Employee Benefit Plan	9 Months Ended
Employee Benefit Plan	Sep. 30, 2017
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plan	11.Employee Benefit Plan We maintain a defined contribution 401(k) plan. The plan covers all full-time U.S. employees over the age of 21. Each employee can contribute up to $18,000 annually (with a $6,000 catch up contribution limit for employees aged 50 or older). We have the option to provide matching contributions, but have not done so to date.