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