Note 3—Earnings Per Share

As of September 30, 2017, the Company had two classes of common stock, Class A and Class B. Basic and diluted earnings (loss) per share attributable to common stockholders for Class A and Class B common stock were the same because they were entitled to the same liquidation and dividend rights.

The reconciliations of the numerators and denominators of the basic and diluted earnings (loss) per share computations are as follows (in thousands, except per share amounts):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2017		2016			2017		2016
Earnings (loss) per share—basic:
Numerator:
Net income	$	10,229	$	3,644		$	33,987	$	10,202
Less: Income attributable to convertible preferred stock		—		(2,672	)		—		—
Less: Premium on repurchase of convertible preferred stock		—		—			—		(47,209	)
Net income (loss) attributable to common stockholders—basic	$	10,229	$	972		$	33,987	$	(37,007	)
Denominator:
Weighted-average shares outstanding		40,700		12,629			39,977		11,461
Earnings (loss) per share—basic	$	0.25	$	0.08		$	0.85	$	(3.23	)
Earnings (loss) per share—diluted:
Numerator:
Net income (loss) attributable to common stockholders—diluted	$	10,229	$	972		$	33,987	$	(37,007	)
Denominator:
Weighted-average shares outstanding		40,700		12,629			39,977		11,461
Options to purchase common stock		3,078		4,430			3,593		—
Employee stock purchase plan shares		322		5			250		—
Restricted stock		145		—			99		—
Weighted-average shares outstanding—diluted		44,245		17,064			43,919		11,461
Earnings (loss) per share—diluted	$	0.23	$	0.06		$	0.77	$	(3.23	)

Anti-dilutive shares for equity awards under stock-based award plans excluded from the calculations of diluted earnings (loss) per share were 0.9 million and 0.4 million for the three months ended September 30, 2017 and 2016, respectively. Anti-dilutive shares for equity awards under stock-based award plans excluded from the calculations of diluted earnings (loss) per share were 0.9 million and 5.2 million shares for the nine months ended September 30, 2017 and 2016, respectively.