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Preferred Stock	9 Months Ended
Preferred Stock	Sep. 30, 2017
Equity [Abstract]
Preferred Stock	7. Preferred Stock On July 5, 2017, in connection with the closing of the Company’s IPO, the Company effected its amended and restated certificate of incorporation, which authorizes the Company to issue 5,000,000 shares of preferred stock, $0.001 par value per share.