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Debt (Silicon Valley Bank Loan and Security Agreement) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 29, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal amount |  | $ 0 |  | $ 0 |  | $ 189,122,000
Gain or loss on extinguishment of debt |  | (6,239,000) | $ 0 | (6,239,000) | $ 0 |
Silicon Valley Bank Term Loan and Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Collateral balance |  |  |  |  |  | 81,600,000
Term loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding principal amount |  | $ 0 |  | $ 0 |  | $ 80,000,000
Term loan [Member] | Silicon Valley Bank Term Loan and Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount repaid | $ 80,000,000 |  |  |  |  |
Accrued interest paid | 100,000 |  |  |  |  |
Gain or loss on extinguishment of debt | $ 0 |  |  |  |  |
Debt, interest rate (as a percent) |  | 1.00% |  | 1.00% |  |
Percentage of security deposit on outstanding obligations |  |  |  | 100.00% |  |
Maximum percentage required for collateral balance |  |  |  | 107.00% |  |

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- Definition The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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