Rigel Pharmaceuticals, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Cover
- DOCUMENT AND ENTITY INFORMATION
Financial Statements
Notes to Financial Statements
Accounting Policies
- Summary of Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Cash, Cash Equivalents and Short-Term Investments - Unrealized Loss Position (Details)

v3.21.2

Cash, Cash Equivalents and Short-Term Investments - Unrealized Loss Position (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) security position	Dec. 31, 2020
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position
Weighted-average time to maturity of cash equivalents and available-for-sale securities	227 days	78 days
Number of investments in continuous unrealized loss position for more than 12 months \| position	0
Number of individual securities in unrealized loss position for 12 months or less \| security	19
Other-than-temporary impairments of securities	$ 0
Fair Value	38,488
Unrealized Losses	(7)
U.S. treasury bills
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position
Fair Value	12,814
Unrealized Losses	(2)
Government-sponsored enterprises securities
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position
Fair Value	3,338
Unrealized Losses	(1)
Corporate bonds and commercial paper
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position
Fair Value	22,336
Unrealized Losses	$ (4)

- Definition

Represents the weighted-average period of maturity of cash equivalents and available-for-sale debt securities.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings.

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