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, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Cash, cash equivalent and short term investments        
Cash and cash equivalents $ 74,696 $ 76,322 [1] $ 40,125 $ 38,290
Short-term investments 53,227 52,215 [1]    
Cash, cash equivalents and short-term investments 127,923 128,537    
Money market funds        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 10,334 9,106    
U.S. treasury bills        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 2,293      
Government-sponsored enterprises securities        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 2,486 7,872    
Corporate bonds and commercial paper        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 111,514 108,933    
Cash        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments $ 1,296 $ 2,626    
[1] The balance sheet at December 31, 2018 has been derived from the audited financial statements included in Rigel’s Annual Report on Form 10-K for the year ended December 31, 2018.