Quarterly report [Sections 13 or 15(d)]

Cash, Cash Equivalents, Restricted Cash, and Short-Term Investments - Schedule of Cash, Cash Equivalents and Short-Term Investments (Details)

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Cash, Cash Equivalents, Restricted Cash, and Short-Term Investments - Schedule of Cash, Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]    
Cash and cash equivalents $ 24,411 $ 40,580 [1]
Short-term investments 122,273 114,375 [1]
Restricted cash reported within other assets 57 57
Cash, cash equivalents and short-term investments 146,741 155,012
Money market funds    
Debt Securities, Available-for-Sale [Line Items]    
Cash, cash equivalents and short-term investments 12,593 14,509
US treasury bills    
Debt Securities, Available-for-Sale [Line Items]    
Cash, cash equivalents and short-term investments 76,474 63,994
Government-sponsored enterprise securities    
Debt Securities, Available-for-Sale [Line Items]    
Cash, cash equivalents and short-term investments 23,113 20,692
Corporate bonds and commercial paper    
Debt Securities, Available-for-Sale [Line Items]    
Cash, cash equivalents and short-term investments 23,785 35,740
Cash    
Debt Securities, Available-for-Sale [Line Items]    
Cash, cash equivalents and short-term investments 10,719 20,020
Restricted cash    
Debt Securities, Available-for-Sale [Line Items]    
Cash, cash equivalents and short-term investments $ 57 $ 57
[1] The balance sheet as of December 31, 2025 has been derived from the audited financial statements included in Rigel’s Annual Report on Form 10-K for the year ended December 31, 2025 filed with the Securities and Exchange Commission (SEC) on March 3, 2026.