Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

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, 2015				Nine Months Ended September 30, 2015
	2015		2014		2015		2014
Cost of revenue	$	991	$	1,110	$	2,835	$	3,391
Research and development		22,308		24,281		70,485		60,293
Sales and marketing		2,045		1,187		5,181		4,505
General and administrative		5,092		9,717		21,302		25,279
Total stock-based expense	$	30,436	$	36,295	$	99,803	$	93,468

Schedule of Share Based Compensation Stock Option Activity

The following table shows stock option activity for the nine months ended September 30, 2015 (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, 2014		39,460		$	2.22	$	47,347		6.74
Granted		300			2.99
Forfeited and cancelled		(11,355	)		3.37
Exercised		(3,071	)		0.46
Balance as of September 30, 2015		25,334		$	1.93	$	31,980		5.71

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, 2015 (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, 2014		69,883		$	3.64	$	185,889
Granted		33,747			2.80
Vested		(21,015	)		4.04
Forfeited and cancelled		(21,717	)		3.22
Unvested as of September 30, 2015		60,898		$	3.18	$	138,847

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, 2015 (in thousands):

	Foreign Currency Translation			Unrealized Gains (Losses) on Available- for-Sale Securities			Total
Balance as of June 30, 2015	$	(24,669	)	$	(16	)	$	(24,685	)
Other comprehensive income (loss) before reclassifications		(16,858	)		130			(16,728	)
Amounts reclassified from accumulated other comprehensive income		—			(1	)		(1	)
Net current-period other comprehensive income (loss)		(16,858	)		129			(16,729	)
Balance as of September 30, 2015	$	(41,527	)		113			(41,414	)
	Foreign Currency Translation			Unrealized Gains (Losses) on Available- for-Sale Securities			Total
Balance as of December 31, 2014	$	(28,781	)	$	(394	)	$	(29,175	)
Other comprehensive income (loss) before reclassifications		(12,746	)		540			(12,206	)
Amounts reclassified from accumulated other comprehensive income		—			(33	)		(33	)
Net current-period other comprehensive income (loss)		(12,746	)		507			(12,239	)
Balance as of September 30, 2015	$	(41,527	)		113			(41,414	)