Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments Financial Instruments (Details 1)

v3.5.0.2
Financial Instruments Financial Instruments (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 39,200 $ 79,800
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 10 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 114
Available-for-sale Securities 39,210 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 10,311 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 10,311 17,144
Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 28,889 62,656
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 10 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 114
Available-for-sale Securities 28,899 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 2,000 17,303
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 30
Available-for-sale Securities 2,000 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 26,889 45,353
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 10 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 84
Available-for-sale Securities 26,899 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 10,311 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 10,311 17,144
Fair Value, Measurements, Recurring [Member] | Contingent Consideration [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Combination, Contingent Consideration, Liability, Noncurrent 265  
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Combination, Contingent Consideration, Liability, Noncurrent 265 395
Available-for-sale Securities 39,210 79,686
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Contingent Consideration [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Combination, Contingent Consideration, Liability, Noncurrent 265 395
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities $ 10,311 $ 17,144