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Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016
Accounting Policies [Abstract] |  |  |  |  |  |
Net loss on foreign currency translations | $ (4,952) | $ (270) | $ (512) |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained Earnings | 5,014 | (107,620) |  | $ (82,784) | $ (77,836) | $ (66,397)
Cumulative effect of adjustment to retained earnings (ASU Adoption) |  | (3,196) | 234 |  |  |
Capitalized Contract Cost, Net | 700 |  |  |  |  |
Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of adjustment to retained earnings (ASU Adoption) |  | $ (3,196) | $ (476) |  |  |
Accounting Standards Update 2016-16 | Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of adjustment to retained earnings (ASU Adoption) | 300 |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained Earnings | $ (10,100) |  |  |  |  |

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