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Net loss per common stock	9 Months Ended
Net loss per common stock	Sep. 30, 2018
Earnings Per Share [Abstract]
Net loss per common stock	8. Net loss per common stock Basic and diluted net loss per common stock is computed by dividing net loss by the weighted average number of common stock outstanding. The Company excluded outstanding stock options to purchase 3,357,264 shares for the three and nine months ended September 30, 2018 and 2,073,542 shares for the three and nine months ended September 30, 2017 from the computation of basic and diluted net loss per common stock as the effect would have been antidilutive for all periods presented.