Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2016

Stock-Based Expense Related to Grants of Employee and Consultant Stock Options, Restricted Stock and Restricted Stock Units (ZSUs)

We recorded stock-based expense related to grants of employee and consultant stock options, restricted stock and restricted stock units (“ZSUs”) in our consolidated statements of operations as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2016		2015		2016		2015
Cost of revenue	$	1,049	$	991	$	2,825	$	2,835
Research and development		18,662		22,308		63,078		70,485
Sales and marketing		1,541		2,045		5,738		5,181
General and administrative		3,223		5,092		9,341		21,302
Total stock-based expense	$	24,475	$	30,436	$	80,982	$	99,803

Schedule of Share Based Compensation Stock Option Activity

The following table shows stock option activity for the nine months ended September 30, 2016 (in thousands, except weighted-average exercise price and weighted-average contractual term):

	Outstanding Options
				Weighted-		Aggregate		Weighted-
				Average		Intrinsic Value of		Average
				Exercise		Stock Options		Contractual Term
	Stock Options			Price		Outstanding		(in years)
Balance as of December 31, 2015		23,215		$	1.93	$	35,949		5.36
Granted		15,000			2.54
Forfeited and cancelled		(2,857	)		3.01
Exercised		(3,693	)		0.27
Balance as of September 30, 2016		31,665		$	2.32	$	34,718		6.58

Schedule of Share Based Compensation Restricted Stock Units Award Activity

The following table shows a summary of ZSU activity for the nine months ended September 30, 2016 (in thousands, except weighted-average grant date fair value):

	Outstanding ZSUs
				Weighted-		Aggregate
				Average Grant Date		Intrinsic Value of
	Shares			Fair Value		Unvested ZSUs
Unvested as of December 31, 2015		62,436		$	3.06	$	167,328
Granted		31,596			2.27
Vested		(22,386	)		2.82
Forfeited and cancelled		(9,289	)		2.86
Unvested as of September 30, 2016		62,357		$	2.78	$	181,459

Schedule of Accumulated Other Comprehensive Income Loss

The following table shows a summary of changes in accumulated other comprehensive income by component for the three and nine months ended September 30, 2016 (in thousands):

	Foreign Currency Translation			Unrealized Gains (Losses) on Available-for-Sale Securities			Total
Balance as of June 30, 2016	$	(100,521	)	$	3		$	(100,518	)
Other comprehensive income (loss) before reclassifications		(6,030	)		(7	)		(6,037	)
Amounts reclassified from accumulated other comprehensive income (loss)		—			—			—
Net current-period other comprehensive income (loss)		(6,030	)		(7	)		(6,037	)
Balance as of September 30, 2016	$	(106,551	)	$	(4	)	$	(106,555	)

	Foreign Currency Translation			Unrealized Gains (Losses) on Available-for-Sale Securities			Total
Balance as of December 31, 2015	$	(52,261	)	$	(127	)	$	(52,388	)
Other comprehensive income (loss) before reclassifications		(54,290	)		124			(54,166	)
Amounts reclassified from accumulated other comprehensive income (loss)		—			(1	)		(1	)
Net current-period other comprehensive income (loss)		(54,290	)		123			(54,167	)
Balance as of September 30, 2016	$	(106,551	)	$	(4	)	$	(106,555	)