Net loss per common stock

12 Months Ended

Dec. 31, 2016

9. 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 and common stock warrants from the calculation of basic and diluted net loss per common stock as the effect would have been antidilutive for all periods presented.

The detail of the computation of basic and diluted net loss per common stock is as follows:


	YEARS ENDED DECEMBER 31,
	2016			2015			2014
*Numerator*
Net loss	$	(37,002	)	$	(21,860	)	$	(24,027	)
Accretion for liquidation preference on preferred stock		—			—			(1,133	)
Accretion for share issuance costs on preferred stock		—			—			(20	)
Tax expense on preferred stock		—			—			(100	)
Reversal of tax payable on preferred stock due to conversion of preferred stock		—			—			1,898
Extinguishment of remaining share issuance costs due to conversion of preferred stock		—			—			(439	)

Total loss attributable to common stockholders	$	(37,002	)	$	(21,860	)	$	(23,821	)

*Denominator*
Weighted average number of shares used to compute basic and diluted net loss per common stock		18,893,515			12,637,839			8,667,387

Net loss per common stock attributable to common stockholders—basic and diluted	$	(1.96	)	$	(1.73	)	$	(2.75	)

The following have been excluded from the computation of basic and diluted net loss per common stock as their effect would have been antidilutive:


	DECEMBER 31, 2016		DECEMBER 31, 2015		DECEMBER 31, 2014
Outstanding stock options		1,378,352		865,457		824,608
Common stock warrants		—		11,363		11,363

Total		1,378,352		876,820		835,971