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

Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Short-Term Investments (Details)

Cash, Cash Equivalents and Short-Term Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Cash, cash equivalents and short term investments.
Cash and cash equivalents	$ 42,718	$ 15,203	$ 14,910	$ 20,854
Short-term investments	118,437us-gaap_ShortTermInvestments	127,956us-gaap_ShortTermInvestments
Cash, cash equivalents and short-term investments	161,155	143,159
Money Market Funds
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments	26,978	10,027
U S Treasury Securities
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments		2,010
U S Government Sponsored Enterprises Debt Securities
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments	42,129	45,786
Corporate Bond Securities And Commercial Paper
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments	90,905	85,161
Demand Deposits
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments	$ 1,143	$ 175

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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