Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Details 1)

v3.8.0.1
Financial Instruments (Details 1)
$ in Thousands
Dec. 31, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Available-for-sale Securities, Amortized Cost Basis $ 93,129
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 39
Available-for-sale Securities 93,090
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 39,181
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0
Available-for-sale Securities 39,181
Investments [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Available-for-sale Securities, Amortized Cost Basis 53,948
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 39
Available-for-sale Securities 53,909
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 28,025
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 32
Available-for-sale Securities 27,993
Corporate Debt Securities [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Available-for-sale Securities, Amortized Cost Basis 25,923
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 7
Available-for-sale Securities 25,916
Money Market Funds [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Available-for-sale Securities, Amortized Cost Basis 39,181
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0
Available-for-sale Securities 39,181
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Available-for-sale Securities 93,090
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 375
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 $ 39,181