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, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Cash, cash equivalent and short term investments        
Cash and cash equivalents $ 20,047 $ 30,373 $ 45,225 $ 22,521
Short-term investments 19,298 26,954    
Cash, cash equivalents and short-term investments 39,345 57,327    
Money market funds        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 11,836 19,487    
U.S. treasury bills        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments   10,034    
Government-sponsored enterprises securities        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 3,001 4,920    
Corporate bonds and commercial paper        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 23,396 20,898    
Cash        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments $ 1,112 $ 1,988