Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2016

Net Loss per Share

Schedule of calculation of basic and diluted net loss per share

	Year Ended
	December 31,
	2016		2015		2014
Numerator:
Net loss	$	(6,250)	$	(2,864)	$	(1,107)
Decretion (accretion) of redeemable convertible preferred stock		2,439		(9,966)		(3,884)
Net loss attributable to common stockholders, basic	$	(3,811)	$	(12,830)	$	(4,991)
Decretion of redeemable convertible preferred stock		(2,439)		—		—
Revaluation of warrant liability		(639)		—		—
Net loss attributable to common stockholders, diluted	$	(6,889)	$	(12,830)	$	(4,991)
Denominator (basic):
Weighted average shares of common stock outstanding, basic		7,486,131		4,318,779		4,052,590
Denominator (diluted):
Weighted average shares of common stock outstanding		7,486,131		4,318,779		4,052,590
Effect of potential dilutive securities:
Dilutive effect from preferred stock and preferred stock warrants assuming conversion		4,105,079		—		—
Weighted average shares of common stock outstanding, diluted		11,591,210		4,318,779		4,052,590
Net loss per share attributable to common stockholders, basic	$	(0.51)	$	(2.97)	$	(1.23)
Net loss per share attributable to common stockholders, diluted	$	(0.59)	$	(2.97)	$	(1.23)

Schedule of shares excluded from the calculation of diluted net loss per share attributable to common stockholders

	Year Ended
	December 31,
	2016	2015	2014
Stock options to purchase common stock	3,059,690	2,791,754	2,845,226
Restricted stock	722,646	—	—
Common stock warrants	32,216	446,593	442,108
Preferred stock warrants (as converted to common stock)	—	463,589	463,589
Redeemable convertible preferred stock (as converted to common stock)	—	5,089,436	5,089,436
	3,814,552	8,791,372	8,840,359