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Description of Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 31, 2016
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred tax asset | $ 52,539 |  | $ 54,166
Deferred tax asset, valuation allowance | 52,275 |  | $ 53,598
ASU 2016-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred tax asset |  | $ 5,300 |
Deferred tax asset, valuation allowance |  | 5,300 |
Accumulated Deficit | ASU 2016-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Effect on financial statements |  | $ 200 |
Pro Forma | Minimum | Accumulated Deficit | ASU 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Effect on financial statements | 18,000 |  |
Pro Forma | Maximum | Accumulated Deficit | ASU 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Effect on financial statements | $ 28,000 |  |

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