Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments Financial Instruments (Details 1)

v3.4.0.3
Financial Instruments Financial Instruments (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0  
Available-for-sale Securities, Amortized Cost Basis 119,809 $ 79,800
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 27 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 16 114
Available-for-sale Securities 119,820 79,686
Cash and Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 29,828 17,144
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Available-for-sale Securities 29,828 17,144
Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 89,981 62,656
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 27 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 16 114
Available-for-sale Securities 89,992 62,542
US Government Agencies Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 35,332 17,303
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 9 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 3 30
Available-for-sale Securities 35,338 17,273
Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 54,649 45,353
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 18 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 13 84
Available-for-sale Securities 54,654 45,269
Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 29,828 17,144
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Available-for-sale Securities 29,828 17,144
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities, Current 241 395
Available-for-sale Securities 119,820 79,686
Estimate of Fair Value Measurement [Member] | Money Market Funds [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 29,828 17,144
Estimate of Fair Value Measurement [Member] | Contingent Consideration [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities, Current $ 241 $ 395