Investments and Fair Value Measurements - FV Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	$ 44,962	$ 44,003
Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Total	18,847	19,128
Liabilities [Abstract]
Foreign currency hedge obligations	142	36
Recurring [Member] | Certificates of Deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents, fair value disclosure	9,954	9,783
Recurring [Member] | Corporate Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	8,593	8,713
Recurring [Member] | Corporate Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	300	632
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Total	300	632
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	300	632
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Total	18,547	18,496
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	9,954	9,783
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	8,593	8,713
Recurring [Member] | Significant Other Observable Inputs (Level 3) [Member]
Liabilities [Abstract]
Foreign currency hedge obligations	$ 142	$ 36