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
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Cash, cash equivalent and short term investments        
Cash and cash equivalents $ 25,950 $ 43,456 $ 38,577 $ 15,203
Short-term investments 59,305 82,820    
Cash, cash equivalents and short-term investments 85,255 126,276    
Money market funds        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 11,182 26,291    
U.S. treasury securities        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 8,307 9,048    
U.S. Government-sponsored enterprises securities        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 16,825 48,613    
Corporate bonds and commercial paper        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 45,227 40,206    
Cash        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments $ 3,714 $ 2,118