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, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Cash, cash equivalent and short term investments        
Cash and cash equivalents $ 36,567 $ 22,521 $ 39,093 $ 76,322
Short-term investments 36,245 75,557    
Cash, cash equivalents and short-term investments 72,812 98,078    
Money market funds        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 17,625 7,457    
U.S. treasury bills        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 23,297 12,539    
Government-sponsored enterprises securities        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 18,451 19,017    
Corporate bonds and commercial paper        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 11,947 55,694    
Cash        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments $ 1,492 $ 3,371