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Commitments and Contingencies (Operating lease) (Details) $ in Thousands		1 Months Ended			12 Months Ended
	Aug. 31, 2017 ft²	Aug. 31, 2014 ft²	Jul. 31, 2013 ft²	Mar. 31, 2012	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($) ft²
Commitments And Contingencies Disclosure [Line Items]
Future minimum payments related to operating lease					$ 16,405
Office space, square feet vacated | ft²							11,200
Office space, square feet reoccupied | ft²						5,400
Operating lease expense					4,600	$ 4,500	$ 5,400
Mountain View, California lease agreement
Commitments And Contingencies Disclosure [Line Items]
Operating lease, term				10 years
Operating lease, percentage of annual base rent increase				3.00%
Future minimum payments related to operating lease					4,200
Westford, Massachusetts Lease Agreement
Commitments And Contingencies Disclosure [Line Items]
Operating lease, term			5 years 3 months
Future minimum payments related to operating lease					400
Office space, square feet | ft²			20,000
Gold River, California Lease Agreement
Commitments And Contingencies Disclosure [Line Items]
Operating lease, term		4 years 5 months
Future minimum payments related to operating lease					3,400
Office space, square feet | ft²		50,000
South Jordan, Utah
Commitments And Contingencies Disclosure [Line Items]
Operating lease, term	5 years 3 months
Future minimum payments related to operating lease					$ 3,400
Office space, square feet | ft²	28,000

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Area Of Real Estate Property, Reoccupied

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Commitments And Contingencies Disclosure [Line Items]

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Operating Lease Base Rent Annual Increase, Percentage

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Area of a real estate property.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

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