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Net loss per common stock	12 Months Ended
Net loss per common stock	Dec. 31, 2018
Earnings Per Share [Abstract]
Net loss per common stock	11. 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 2,897,294 shares, 2,069,167 shares and 1,378,352 shares for years ended December 31, 2018, 2017 and 2016, respectively, from the computation of basic and diluted net loss per common stock as the effect would have been antidilutive for all periods presented.