Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Short-Term Investments (Details 2)

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Cash, Cash Equivalents and Short-Term Investments (Details 2) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Cash equivalents and available-for-sale securities    
Amortized Cost $ 108,197 $ 132,964
Gross Unrealized Gains 29 25
Gross Unrealized Losses (4) (32)
Fair Value $ 108,222 132,957
Cash equivalent and short-term investments contractual maturities 1 year  
U S Treasury Securities    
Cash equivalents and available-for-sale securities    
Amortized Cost   2,010
Fair Value   2,010
U S Government Sponsored Enterprises Debt Securities    
Cash equivalents and available-for-sale securities    
Amortized Cost $ 50,249 45,793
Gross Unrealized Gains 12 4
Gross Unrealized Losses (1) (11)
Fair Value 50,260 45,786
Corporate Bond Securities And Commercial Paper    
Cash equivalents and available-for-sale securities    
Amortized Cost 57,948 85,161
Gross Unrealized Gains 17 21
Gross Unrealized Losses (3) (21)
Fair Value $ 57,962 $ 85,161