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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative-effect adjustment for adoption of ASU 2016-09 |  | $ 4,724
Retained Earnings [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative-effect adjustment for adoption of ASU 2016-09 |  | $ 2,684
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative-effect adjustment for adoption of ASU 2016-09 | $ 2,700 |

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