Commitments and Contingencies (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Contractual obligations
Remainder of 2017	[1]	$ 7,222		$ 7,222
2018	[1]	162,175		162,175
2019	[1]	15,765		15,765
2020	[1]	7,531		7,531
2021	[1]	4,793		4,793
Contractual Obligation, Payments Due after Fourth Full Fiscal Year	[1]	4,230		4,230
Contractual Obligation	[1]	201,716		201,716
Unrecognized tax benefits		22,900		22,900		$ 21,900
Unrecognized tax benefits, reduction of long-term deferred tax assets		20,700		20,700		19,700
Unrecognized tax benefits included in long-term income taxes payable		2,200		$ 2,200		2,200
Terms of noncancellable license agreement, minimum (in years)				1 year
Rent expense		1,200	$ 1,100	$ 3,200	$ 2,700
Deferred Rent Credit, Current		500		500		$ 500
Imputed financing obligation
Contractual obligations
Remainder of 2017	[1],[2]	1,593		1,593
2018	[1],[2]	6,447		6,447
2019	[1],[2]	6,602		6,602
2020	[1],[2]	2,869		2,869
2021	[1],[2]	0		0
Contractual Obligation, Payments Due after Fourth Full Fiscal Year	[1],[2]	0		0
Contractual Obligation	[1],[2]	17,511		17,511
Leases and other contractual obligations
Contractual obligations
Remainder of 2017	[1]	3,020		3,020
2018	[1]	6,000		6,000
2019	[1]	5,631		5,631
2020	[1]	4,662		4,662
2021	[1]	4,793		4,793
Contractual Obligation, Payments Due after Fourth Full Fiscal Year	[1]	4,230		4,230
Contractual Obligation	[1]	28,336		28,336
Software licenses
Contractual obligations
Remainder of 2017	[1],[3]	2,609		2,609
2018	[1],[3]	10,176		10,176
2019	[1],[3]	3,532		3,532
2020	[1],[3]	0		0
2021	[1],[3]	0		0
Contractual Obligation, Payments Due after Fourth Full Fiscal Year	[1],[3]	0		0
Contractual Obligation	[1],[3]	16,317		16,317
Convertible notes
Contractual obligations
Remainder of 2017	[1]	0		0
2018	[1]	138,000		138,000
2019	[1]	0		0
2020	[1]	0		0
2021	[1]	0		0
Contractual Obligation, Payments Due after Fourth Full Fiscal Year	[1]	0		0
Contractual Obligation	[1]	138,000		138,000
Interest payments related to convertible notes
Contractual obligations
Remainder of 2017	[1]	0		0
2018	[1]	1,552		1,552
2019	[1]	0		0
2020	[1]	0		0
2021	[1]	0		0
Contractual Obligation, Payments Due after Fourth Full Fiscal Year	[1]	0		0
Contractual Obligation	[1]	$ 1,552		$ 1,552

[1] The above table does not reflect possible payments in connection with uncertain tax benefits of approximately $22.9 million including $20.7 million recorded as a reduction of long-term deferred tax assets and $2.2 million in long-term income taxes payable as of September 30, 2017. As noted below in Note 12, “Income Taxes,” although it is possible that some of the unrecognized tax benefits could be settled within the next 12 months, the Company cannot reasonably estimate the outcome at this time.

[2] With respect to the imputed financing obligation, the main components of the difference between the amount reflected in the contractual obligations table and the amount reflected on the unaudited condensed consolidated balance sheets are the interest on the imputed financing obligation and the estimated common area expenses over the future periods. The amount includes the amended Ohio lease and the amended Sunnyvale lease.

[3] The Company has commitments with various software vendors for non-cancellable agreements generally having terms longer than one year.