Net loss per common stock

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Net loss per common stock

12. 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 the following outstanding stock options and restricted stock units from the computation of basic and diluted net loss per common stock as the effect would have been antidilutive for all periods presented.

	YEARS ENDED DECEMBER 31,
	2019		2018		2017
Outstanding stock options		5,840,538		2,897,294		2,069,167
Restricted stock units		72,000		—		—
		5,912,538		2,897,294		2,069,167