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Summary of Significant Accounting Policies - Advertising and Sales Promotion Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Selling, General and Administrative Expenses [Member] |  |  |
Advertising Costs [Line Items] |  |  |
Advertising Costs | $ 0.6 | $ 0.7 | $ 0.9

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- Definition Advertising Costs [Line Items] [Line Items] + References No definition available. + Details
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Period Type: | duration

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
Name: | us-gaap_AdvertisingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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