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) - Jun. 30, 2015
$ in Thousands
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 123 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 34
Other-than-temporary impairments of securities $ 0
Fair Value 53,875
Unrealized Losses (18)
U S Government Sponsored Enterprises Debt Securities  
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position  
Fair Value 18,337
Unrealized Losses (4)
Corporate Bond Securities And Commercial Paper  
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position  
Fair Value 35,538
Unrealized Losses $ (14)