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)

v3.10.0.1

Cash, Cash Equivalents and Short-Term Investments - Unrealized Loss Position (Details) $ in Thousands		9 Months Ended
	Sep. 30, 2018 USD ($) item	Sep. 30, 2018 USD ($) item
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	58 days
Number of investments in continuous unrealized loss position for more than twelve months \| item	0	0
Number of individual securities in unrealized loss position for twelve months or less \| item	29	29
Other-than-temporary impairments of securities	$ 0
Fair Value	53,411	$ 53,411
Unrealized Losses		(26)
U.S. treasury bills
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position
Fair Value	4,248	4,248
Unrealized Losses		(2)
Government-sponsored enterprises securities
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position
Fair Value	14,489	14,489
Unrealized Losses		(4)
Corporate bonds and commercial paper
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position
Fair Value	$ 34,674	34,674
Unrealized Losses		$ (20)

- Definition

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

+ References

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- Definition

Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- Definition

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

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- Definition

Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562

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