Net Loss per Share

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Net Loss per Share

Note 12. Net Loss per Share

The following table summarizes the computation of basic and diluted net loss per share (in thousands, except share and per share data):

	Year Ended December 31,
	2015			2016			2017
Numerator:
Net loss	$	(6,191	)	$	(6,860	)	$	(9,980	)
Denominator:
Weighted-average shares outstanding, basic and    diluted		1,552,780			1,602,402			6,197,775
Net loss per share	$	(3.99	)	$	(4.28	)	$	(1.61	)

The following potentially dilutive shares outstanding at the end of the periods presented were excluded in the calculation of diluted net loss per share as the effect would have been anti-dilutive:

	Year Ended December 31,
	2015		2016		2017
Options to purchase common stock		938,250		1,130,141		1,294,128
Unvested restricted stock units		—		—		47,312
Warrants to purchase Series B-1 convertible    preferred or common stock		680,027		680,027		468,278
Series B-1 convertible preferred stock (as-converted)		3,848,023		3,848,023		—
Series A-2 convertible preferred stock (as-converted)		841,730		841,730		—
Total		6,308,030		6,499,921		1,809,718