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Summary of Significant Accounting Policies - Additional Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2017
Class of Warrant or Right [Line Items] |  |  |  |
Advertising costs | $ 1,100 | $ 1,100 | $ 1,100 |
Other shipping and handling costs | $ 12,200 | 11,600 | $ 12,700 |
Maturity of foreign currency exchange contracts | 9 months |  |  |
Retained earnings | $ 266,780 | 275,594 |  |
Deferred income taxes | $ 7,913 |  |  |
Impact to retained earnings from adoption of ASU 2016-09 |  | 1,509 |  |
Performance-based warrants |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Dividend yield | 0.00% |  |  |
Accounting Standards Update 2016-09 |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Deferred income taxes |  |  |  | $ 1,500
Retained Earnings |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Impact to retained earnings from adoption of ASU 2016-09 |  | $ 1,509 |  |
Retained Earnings | Accounting Standards Update 2016-09 |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Impact to retained earnings from adoption of ASU 2016-09 |  |  |  | $ 1,500
Minimum | Cumulative-effect adjustment | Pro Forma | Accounting Standards Update 2014-09 |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Retained earnings | $ 4,000 |  |  |
Maximum | Cumulative-effect adjustment | Pro Forma | Accounting Standards Update 2014-09 |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Retained earnings | $ 5,000 |  |  |

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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
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