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

9 Months Ended

Sep. 30, 2014

Earnings Per Share [Abstract]

Schedule of Net Income per Share, Basic and Diluted

The following table presents the calculations of basic and diluted net income (loss) per share attributable to Class A and Class B common stockholders:

	Three months ended									Nine months ended
(in thousands, except per share amounts)	September 30,  2014						September 30, 2013			September 30, 2014					September 30, 2013
	Class A			Class B			Class B			Class A			Class B		Class B
Numerator:
Add: allocation of net income (loss)	$	2,395		$	12,225		$	(1,101	)	417			$	5,411	$	16,849
Less: undistributed earnings allocable to:
holders of preferred stock	—			—			—			(72)			(932)		(4,601)
holders of unvested early exercised options and restricted stock	(6		)	(30		)	—			(1		)	(17)		(52		)
Undistributed net income (loss) attributable to common stockholders—basic	$	2,389		$	12,195		$	(1,101	)	$	344		$	4,462	$	12,196
Add: adjustments to net income (loss) for dilutive securities allocable to:
holders of preferred stock	—			—			—			10			128		631
holders of unvested early exercised options and restricted stock	1			4			—			—			2		7
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares	12,195			—			—			4,462			—		—
Undistributed net income (loss) attributable to common stockholders—diluted	$	14,585		$	12,199		$	(1,101	)	$	4,816		$	4,592	$	12,834
Denominator:
Weighted-average common shares—basic	20,597			105,116			81,070			6,941			89,964		80,914
Conversion of Class B to Class A common stock outstanding	105,116			—			—			89,964			—		—
Effect of potentially dilutive securities:
Stock options and RSUs	19,473			19,317			—			18,673			18,621		17,757
Weighted-average common shares—diluted	145,186			124,433			81,070			115,578			108,585		98,671
Net income per share attributable to common stockholders:
Distributed earnings—basic	$	—		$	—		$	—		$	—		$	—	$	—
Undistributed earnings (loss)—basic	0.12			0.12			(0.01		)	0.05			0.05		0.15
Basic net income (loss) per share	$	0.12		$	0.12		$	(0.01	)	$	0.05		$	0.05	$	0.15
Distributed earnings—diluted	$	—		$	—		$	—		$	—		$	—	$	—
Undistributed earnings (loss)—diluted	0.10			0.10			(0.01		)	0.04			0.04		0.13
Diluted net income (loss) per share	$	0.10		$	0.10		$	(0.01	)	$	0.04		$	0.04	$	0.13

Schedule of Antidilutive Securities Excluded from Computation of Net Income per Share

The following potentially dilutive shares of common stock subject to options, RSUs, unvested stock awards and redeemable convertible preferred stock were not included in the calculation of diluted shares outstanding as the effect would have been anti-dilutive:

	Three months ended		Nine months ended
(in thousands)	September 30, 2014	September 30, 2013	September 30, 2014	September 30, 2013
Series A redeemable convertible preferred stock	—	30,523	20,237	30,523
Stock options and RSUs	366	25,784	2,871	1,080
Unvested stock awards and stock options	308	284	376	346
	674	56,591	23,484	31,949