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Commitments and Contingencies (Operating lease) (Details) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 25, 2018 USD ($) ft²	Mar. 31, 2018 USD ($) ft²	Mar. 31, 2012 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Future minimum payments related to operating lease				$ 38,272
Operating lease expense				5,300	$ 4,600	$ 4,500
Santa Clara, California
Commitments And Contingencies Disclosure [Line Items]
Office space, square feet | ft²	32,492
Operating lease, term	123 months
Future minimum payments related to operating lease				17,200
Austin, Texas
Commitments And Contingencies Disclosure [Line Items]
Office space, square feet | ft²		26,878
Operating lease, term		90 months
Future minimum payments related to operating lease				4,400
Standby Letters of Credit | Santa Clara, California
Commitments And Contingencies Disclosure [Line Items]
Letter of credit, outstanding	$ 1,500
Standby Letters of Credit | Austin, Texas
Commitments And Contingencies Disclosure [Line Items]
Letter of credit, outstanding		$ 600
Standby Letters of Credit | Mountain View, California
Commitments And Contingencies Disclosure [Line Items]
Letter of credit, outstanding			$ 600	$ 100
1.5 Million Standby Letter of Credit | Standby Letters of Credit | Santa Clara, California
Commitments And Contingencies Disclosure [Line Items]
Reduction of letter of credit amount, percentage				20.00%
Reduction of letter of credit amount, sixth year percentage	8.00%
.6 Million Standby Letter of Credit | Mountain View, California
Commitments And Contingencies Disclosure [Line Items]
Reduction of letter of credit amount, percentage			25.00%

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Lessee, Operating Leases, Term Of Contract

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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-Name Accounting Standards Codification
-Topic 840
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