Rigel Pharmaceuticals, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Details 1)

CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments	$ 143,159,000	$ 211,975,000
Cash and cash equivalents	15,203,000	20,854,000	33,484,000	18,633,000
Short-term Investments	127,956,000us-gaap_ShortTermInvestments	191,121,000us-gaap_ShortTermInvestments
Available-For-Sale Securities Reconciliation
Amortized Cost	132,964,000	202,674,000
Gross Unrealized Gains	25,000	64,000
Gross Unrealized Losses	(32,000)	(17,000)
Fair Value	132,957,000us-gaap_AvailableForSaleSecurities	202,721,000us-gaap_AvailableForSaleSecurities
Years to Maturity
Within one year	181,846,000
After One Year Through Two Years	20,875,000
Weighted-average time to maturity of cash equivalents and available-for-sale securities	148 days
Proceeds from sale of short term investments		16,479,000
Number of investments in continuous unrealized loss position for more than twelve months	0	4
Investments in unrealized loss position for more than twelve months		2,000
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position
Number of individual securities in unrealized loss position for twelve months or less	31
Fair Value	57,563,000
Unrealized Losses	(32,000)
Money Market Funds [Member]
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments	10,027,000	9,059,000
U S Treasury Securities [Member]
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments	2,010,000	2,085,000
Available-For-Sale Securities Reconciliation
Amortized Cost	2,010,000	2,083,000
Gross Unrealized Gains		2,000
Fair Value	2,010,000	2,085,000
Years to Maturity
After One Year Through Two Years	2,085,000
U S Government Sponsored Enterprises Debt Securities [Member]
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments	45,786,000	67,178,000
Available-For-Sale Securities Reconciliation
Amortized Cost	45,793,000	67,160,000
Gross Unrealized Gains	4,000	29,000
Gross Unrealized Losses	(11,000)	(11,000)
Fair Value	45,786,000	67,178,000
Years to Maturity
Within one year	49,394,000
After One Year Through Two Years	17,784,000
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position
Fair Value	23,122,000
Unrealized Losses	(11,000)
Corporate Bond Securities And Commercial Paper [Member]
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments	85,161,000	133,458,000
Available-For-Sale Securities Reconciliation
Amortized Cost	85,161,000	133,431,000
Gross Unrealized Gains	21,000	33,000
Gross Unrealized Losses	(21,000)	(6,000)
Fair Value	85,161,000	133,458,000
Years to Maturity
Within one year	132,452,000
After One Year Through Two Years	1,006,000
Fair value and gross unrealized losses of investments in individual securities in unrealized loss position
Fair Value	34,441,000
Unrealized Losses	(21,000)
Demand Deposits [Member]
Cash, cash equivalents and short term investments.
Cash, cash equivalents and short-term investments	$ 175,000	$ 195,000