Quarterly report pursuant to Section 13 or 15(d)

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

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Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Cash, cash equivalents and short term investments.        
Cash and cash equivalents $ 14,269 $ 43,456 $ 42,718 $ 15,203
Short-term investments 89,363 82,820    
Cash, cash equivalents and short-term investments 103,632 126,276    
Money Market Funds        
Cash, cash equivalents and short term investments.        
Cash, cash equivalents and short-term investments 4,883 26,291    
U S Treasury Securities        
Cash, cash equivalents and short term investments.        
Cash, cash equivalents and short-term investments 9,062 9,048    
U S Government-Sponsored Enterprises Securities        
Cash, cash equivalents and short term investments.        
Cash, cash equivalents and short-term investments 29,236 48,613    
Corporate Bonds And Commercial Paper        
Cash, cash equivalents and short term investments.        
Cash, cash equivalents and short-term investments 60,113 40,206    
Cash        
Cash, cash equivalents and short term investments.        
Cash, cash equivalents and short-term investments $ 338 $ 2,118