Net Income (Loss) per Share Available to Common Stockholders (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Outstanding Securities Considered Anti-Dilutive

The following table shows the weighted-average outstanding securities considered anti-dilutive and therefore excluded from the computation of diluted net income (loss) per share available to common stockholders (in thousands):

	Year Ended December 31,
	2017		2016		2015
Common stock options and RSUs		346		548		550
Warrants for common stock		100		894		960
Convertible preferred stock		4,372		—		—
Total		4,818		1,442		1,510

Reconciliation of the Numerator and Denominator Used in Calculation of Basic and Diluted Net Income (Loss) per Share Available to Common Stockholders

The following is a reconciliation of the numerators and denominators used in calculating basic and diluted net income (loss) per share available to common stockholders (in thousands):

	Year Ended December 31,
	2017			2016			2015
Numerator
Net income (loss)	$	14,596		$	(53,530	)	$	(20,606	)
Less: Deemed dividend on convertible preferred stock		(5,603	)		—			—
Less: Allocation of undistributed earnings to participating securities		(3,279	)		—			—
Net income (loss) available to common stockholders, basic		5,714			(53,530	)		(20,606	)
Adjustments to undistributed earnings allocated to participating securities		96			—			—
Net income (loss) available to common stockholders, diluted	$	5,810		$	(53,530	)	$	(20,606	)
Denominator
Weighted average shares outstanding used for basic net income (loss) per share available to common stockholders		7,619			6,021			5,890
Effect of dilutive stock options		360			—			—
Effect of dilutive warrants		1			—			—
Weighted average shares outstanding used for diluted net income (loss) per share available to common stockholders		7,980			6,021			5,890
Basic net income (loss) per share of common stock	$	0.75		$	(8.89	)	$	(3.50	)
Diluted net income (loss) per share of common stock	$	0.73		$	(8.89	)	$	(3.50	)