Investments and Fair Value Measurements - FV Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	$ 47,348	$ 44,003
Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Total	30,391	33,714
Liabilities [Abstract]
Foreign currency hedge obligations	53	36
Recurring [Member] | Certificates of Deposit [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents, fair value disclosure	21,744	24,369
Recurring [Member] | Corporate Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	8,464	8,713
Recurring [Member] | Corporate Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	183	632
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Total	183	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	183	632
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Total	30,208	33,082
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	21,744	24,369
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale Securities	8,464	8,713
Recurring [Member] | Significant Other Observable Inputs (Level 3) [Member]
Liabilities [Abstract]
Foreign currency hedge obligations	$ 53	$ 36