Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Short-Term Investments (Details 3)

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Cash, Cash Equivalents and Short-Term Investments (Details 3)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
item
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position  
Weighted-average time to maturity of cash equivalents and available-for-sale securities 101 days
Number of investments in continuous unrealized loss position for more than twelve months | item 0
Number of individual securities in unrealized loss position for twelve months or less | item 14
Other-than-temporary impairments of securities $ 0
Fair Value 21,910
Unrealized Losses (4)
U S Government Sponsored Enterprises Debt Securities  
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position  
Fair Value 2,009
Unrealized Losses (1)
Corporate Bond Securities And Commercial Paper  
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position  
Fair Value 19,901
Unrealized Losses $ (3)