
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2018		2017		2018		2017
Net loss	$	(1,865)	$	(1,537)	$	(9,557)	$	(4,087)
Accretion of cumulative dividends of redeemable preferred stock to redemption value	—		(1,484)		—		(4,364)
Net loss attributable to common stockholders - basic and diluted	$	(1,865)	$	(3,021)	$	(9,557)	$	(8,451)

Weighted average number of shares - basic and diluted	12,624,858		1,773,385		12,417,972		1,754,576
Net loss per share attributable to common stockholders - basic and diluted	$	(0.15)	$	(1.70)	$	(0.77)	$	(4.82)

Our basic and diluted net loss per share is computed using the two-class method. The two-class method is an earnings allocation that determines net income per share for each class of common stock and participating securities according to their participation rights in dividends and undistributed earnings or losses. Non-vested restricted stock that includes non-forfeitable rights to dividends are considered participating securities.

Prior to the completion of our IPO on October 12, 2017, we had authorized 7,000,000 shares of redeemable convertible preferred stock, of which 3,649,475 were outstanding as of September 30, 2017, designated in series, with the rights and preferences of each series determined by the Board of Directors. Upon completion of our IPO, all of our previously outstanding shares of Series A and B Preferred Stock were converted into common stock on a 1:1 conversion ratio. As of September 30, 2018 and December 31, 2017, there are no redeemable convertible preferred shares outstanding. Series A and B preferred stock include rights to participate in dividends and distributions to common stockholders on an if-converted basis, and accordingly are also considered participating securities. During periods of undistributed losses however, no effect is given to our participating securities since they are not contractually obligated to share in the losses.

We have incurred a net loss for all periods presented, such that diluted net loss per common stock is the same as basic net loss per common stock. The following contingently issuable and convertible equity shares were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for all periods presented (shares for the redeemable convertible preferred shares for the nine months ended September 30, 2017 were determined based on the applicable conversion ratio of 1:1):


	As of September 30,
	2018	2017
Redeemable convertible preferred stock - Series A	—	670,000
Redeemable convertible preferred stock - Series B	—	2,979,475
Restricted stock	174,541	704,770
Stock options	114,774	177,763
Warrants	18,566	44,101
	307,881	4,576,109