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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment for adoption of ASU |  |  | $ 1,052
Accounting Standards Update 2016-01 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment for adoption of ASU | $ 200 |  |
Accounting Standards Update 2016-18 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash pledged or on deposit | $ 800 | $ 1,100 | $ 1,000

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