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, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Cash, cash equivalent and short term investments        
Cash and cash equivalents $ 40,125 $ 38,290 [1] $ 40,144 $ 17,632
Short-term investments 54,175 77,461 [1]    
Cash, cash equivalents and short-term investments 94,300 115,751    
Money market funds        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 4,686 2,795    
U.S. treasury bills        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 6,729 6,726    
Government-sponsored enterprises securities        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 6,179 7,826    
Corporate bonds and commercial paper        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments 73,720 97,822    
Cash        
Cash, cash equivalent and short term investments        
Cash, cash equivalents and short-term investments $ 2,986 $ 582    
[1] The balance sheet at December 31, 2017 has been derived from the audited financial statements included in Rigel’s Annual Report on Form 10-K for the year ended December 31, 2017.