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Net loss per common stock	3 Months Ended
Net loss per common stock	Mar. 31, 2018
Earnings Per Share [Abstract]
Net loss per common stock	7. 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 shares of common stock outstanding. The Company excluded outstanding stock options to purchase 2,776,077 shares for the three months ended March 31, 2018 and 2,015,389 shares for the three months ended March 31, 2017 from the computation of basic and diluted net loss per common stock as the effect would have been antidilutive for all periods presented.