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Defined Contribution Plan	12 Months Ended
Defined Contribution Plan	Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract]
Defined Contribution Plan	10. Defined Contribution Plan In September 2016, the Company began to sponsor a 401(k) retirement plan in which substantially all of its full-time employees are eligible to participate. Participants may contribute a percentage of their annual compensation to this plan, subject to statutory limitations. During the year ended December 31, 2016, the Company provided $51,000 in contributions to the plan. The Company did not provide any contributions during the years ended December 31, 2015 or 2014.