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, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Cash, cash equivalent and short term investments        
Cash and cash equivalents $ 25,879 $ 17,632 $ 25,950 $ 43,456
Short-term investments 42,197 57,134    
Cash, cash equivalents and short-term investments 68,076 74,766    
Money market funds        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 5,099 9,496    
U.S. treasury bills        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 3,000 4,300    
Government-sponsored enterprises securities        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 3,655 16,459    
Corporate bonds and commercial paper        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 55,937 44,271    
Cash        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments $ 385 $ 240