Net Loss Per Share Attributable to Common Stockholders (Tables)

9 Months Ended

Sep. 30, 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):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Numerator:
Net loss attributable to common stockholders	$	(8,755	)	$	(9,865	)	$	(23,636	)	$	(28,271	)
Denominator:
Weighted-average common shares outstanding - basic and diluted		13,884			12,754			13,307			12,575
Net loss per common share, basic and diluted	$	(0.63	)	$	(0.77	)	$	(1.78	)	$	(2.25	)

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):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
Options to purchase common shares		11,514		9,154		10,862		9,040
Common stock warrant		46		11		36		4
Convertible preferred shares (as converted)		17,645		18,240		18,040		18,240
Preferred stock warrant		26		27		27		27
		29,231		27,432		28,965		27,311