Net Loss Per Share Attributable to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2016

Computation of Basic and Diluted Net Loss Per Share

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


	Years Ended December 31,
	2016			2015			2014
Numerator:
Net loss attributable to common stockholders	$	(31,553	)	$	(41,007	)	$	(32,872	)
Denominator:
Weighted-average common shares outstanding - basic and diluted		19,595			12,653			12,080
Net loss per common share - basic and diluted	$	(1.61	)	$	(3.24	)	$	(2.72	)

Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Share

The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because the impact of including them would have been antidilutive (in thousands):


	Years Ended December 31,
	2016		2015		2014
Options to purchase common shares		10,969		9,294		8,283
Restricted stock units		41		—		—
Employee stock purchase plan shares		29		—		—
Common stock warrant		36		6		—
Convertible preferred shares (as converted)		13,505		18,240		18,240
Preferred stock warrant (as converted)		20		27		27
		24,600		27,567		26,550