Investments and Fair Value Measurements - FV Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	$ 44,003	$ 48,937
Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Total	19,128	20,146
Liabilities [Abstract]
Foreign currency hedge obligations	36
Recurring [Member] \| Money Market Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents, fair value disclosure		23
Recurring [Member] \| Certificates of Deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents, fair value disclosure	9,783	10,183
Recurring [Member] \| Corporate Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	8,713	9,186
Recurring [Member] \| Corporate Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	632	754
Recurring [Member] \| Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Total	632	777
Recurring [Member] \| Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] \| Money Market Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents, fair value disclosure		23
Recurring [Member] \| Quoted Prices in Active Markets of Identical Assets (Level 1) [Member] \| Corporate Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	632	754
Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Total	18,496	19,369
Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Certificates of Deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents, fair value disclosure	9,783	10,183
Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Corporate Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	8,713	$ 9,186
Recurring [Member] \| Significant Other Observable Inputs (Level 3) [Member]
Liabilities [Abstract]
Foreign currency hedge obligations	$ 36

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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