Commitments and Contingencies (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Dec. 31, 2018
Contractual obligations
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	[1],[2]	$ 5,998
Contractual Obligation, Future Minimum Payments Due, Due in Next Fiscal Year	[1],[2]	5,601
Contractual Obligation, Future Minimum Payments Due, Due in Second Fiscal Year	[1],[2]	4,103
Contractual Obligation, Future Minimum Payments Due, Due in Third Fiscal Year	[1],[2]	2,372
Contractual Obligation, Future Minimum Payments Due, Due in Fourth Fiscal Year	[1],[2]	173,692
Contractual Obligation	[1],[2]	$ 191,766
Terms of noncancellable license agreement, minimum (in years)		1 year
Other Commitments [Domain]
Contractual obligations
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	[1],[2]	$ 815
Contractual Obligation, Future Minimum Payments Due, Due in Next Fiscal Year	[1],[2]	234
Contractual Obligation, Future Minimum Payments Due, Due in Second Fiscal Year	[1],[2]	234
Contractual Obligation, Future Minimum Payments Due, Due in Third Fiscal Year	[1],[2]	0
Contractual Obligation, Future Minimum Payments Due, Due in Fourth Fiscal Year	[1],[2]	0
Contractual Obligation	[1],[2]	1,283
Imputed financing obligation
Contractual obligations
Contractual Obligation, Future Minimum Payments Due, Due in Next Fiscal Year	[3]		$ 5,677
Contractual Obligation, Future Minimum Payments Due, Due in Second Fiscal Year	[3]		2,404
Contractual Obligation, Future Minimum Payments Due, Due in Third Fiscal Year	[3]		0
Contractual Obligation, Future Minimum Payments Due, Due in Fourth Fiscal Year	[3]		0
Contractual Obligation, Future Minimum Payments Due, Due in Fifth Fiscal Year	[3]		0
Contractual Obligation	[3]		8,081
Leases and other contractual obligations
Contractual obligations
Contractual Obligation, Future Minimum Payments Due, Due in Next Fiscal Year			5,333
Contractual Obligation, Future Minimum Payments Due, Due in Second Fiscal Year			4,883
Contractual Obligation, Future Minimum Payments Due, Due in Third Fiscal Year			4,960
Contractual Obligation, Future Minimum Payments Due, Due in Fourth Fiscal Year			3,271
Contractual Obligation, Future Minimum Payments Due, Due in Fifth Fiscal Year			968
Contractual Obligation			19,415
Software licenses
Contractual obligations
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	[1],[2],[4]	3,997
Contractual Obligation, Future Minimum Payments Due, Due in Next Fiscal Year	[1],[2],[4]	2,995
Contractual Obligation, Future Minimum Payments Due, Due in Second Fiscal Year	[1],[2],[4]	1,497
Contractual Obligation, Future Minimum Payments Due, Due in Third Fiscal Year	[1],[2],[4]	0
Contractual Obligation, Future Minimum Payments Due, Due in Fourth Fiscal Year	[1],[2],[4]	0
Contractual Obligation	[1],[2],[4]	8,489
Convertible notes
Contractual obligations
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	[1],[2]	0
Contractual Obligation, Future Minimum Payments Due, Due in Next Fiscal Year	[1],[2]	0
Contractual Obligation, Future Minimum Payments Due, Due in Second Fiscal Year	[1],[2]	0
Contractual Obligation, Future Minimum Payments Due, Due in Third Fiscal Year	[1],[2]	0
Contractual Obligation, Future Minimum Payments Due, Due in Fourth Fiscal Year	[1],[2]	172,500
Contractual Obligation	[1],[2]	172,500
Interest payments related to convertible notes
Contractual obligations
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	[1],[2]	1,186
Contractual Obligation, Future Minimum Payments Due, Due in Next Fiscal Year	[1],[2]	2,372
Contractual Obligation, Future Minimum Payments Due, Due in Second Fiscal Year	[1],[2]	2,372
Contractual Obligation, Future Minimum Payments Due, Due in Third Fiscal Year	[1],[2]	2,372
Contractual Obligation, Future Minimum Payments Due, Due in Fourth Fiscal Year	[1],[2]	1,192
Contractual Obligation	[1],[2]	$ 9,494
Leasing Arrangement [Member]
Contractual obligations
Contractual Obligation, Future Minimum Payments Due, Due in Next Fiscal Year			11,010
Contractual Obligation, Future Minimum Payments Due, Due in Second Fiscal Year			7,287
Contractual Obligation, Future Minimum Payments Due, Due in Third Fiscal Year			4,960
Contractual Obligation, Future Minimum Payments Due, Due in Fourth Fiscal Year			3,271
Contractual Obligation, Future Minimum Payments Due, Due in Fifth Fiscal Year			968
Contractual Obligation			$ 27,496

[1] For the Company's lease commitments, refer to Note 9, "Leases".

[2] The above table does not reflect possible payments in connection with uncertain tax benefits of approximately $24.5 million including $22.2 million recorded as a reduction of long-term deferred tax assets and $2.3 million in long-term income taxes payable as of March 31, 2019. As noted below in Note 14, “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.

[3] With respect to the imputed financing obligation, the main components of the difference between the amount reflected in the table above and the amount reflected on the unaudited condensed consolidated balance sheet 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.

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