INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2014

Investments Schedule [Abstract]

Investments

Investments consist of the following (in thousands):

	March 31, 2014		December 31, 2013
Certificates of deposit	$	11,217	$	11,012
Commercial paper		19,964		4,997
Corporate debt securities		121,940		77,441
Securities of government sponsored entities		12,529		7,500
Total investments	$	165,650	$	100,950

Summary of Investments Classified as Available-For-Sale Securities

The following is a summary of investments classified as available-for-sale securities (in thousands):

	Contractual Maturity (in years)		Amortized Cost		Gross Unrealized Gains(1)		Gross Unrealized Losses(1)			Aggregate Estimated Fair Value
March 31, 2014:
Classified as current assets:
Certificates of deposit		Less than 1	$	9,791	$	1	$	(11	)	$	9,781
Commercial paper		Less than 1		19,968		1		(5	)		19,964
Corporate debt securities		Less than 1		72,094		8		(46	)		72,056
Securities of government sponsored entities		Less than 1		12,531		—		(2	)		12,529
Total short-term available for sale securities			$	114,384	$	10	$	(64	)	$	114,330
Classified as long-term assets:
Certificates of deposit		1-2		1,440		—		(4	)		1,436
Corporate debt securities		1-2		50,020		—		(136	)		49,884
Total long-term available for sale securities				51,460		—		(140	)		51,320
Total available-for-sale securities			$	165,844	$	10	$	(204	)	$	165,650
December 31, 2013:
Classified as current assets:
Certificates of deposit		Less than 1	$	11,018	$	1	$	(7	)	$	11,012
Commercial paper		Less than 1		4,997		—		—			4,997
Corporate debt securities		Less than 1		77,430		19		(8	)		77,441
Securities of government sponsored entities		Less than 1		7,500		—		—			7,500
Total short-term available for sale securities			$	100,945	$	20	$	(15	)	$	100,950

(1) Unrealized gains and losses are included in other comprehensive loss.

Available-For-Sale Investments in Unrealized Loss Position

The following table presents information about available-for-sale investments in an unrealized loss position (in thousands):

	Less Than 12 Months					12 Months or Greater				Total
	Estimated Fair Value		Unrealized Losses			Estimated Fair Value		Unrealized Losses		Estimated Fair Value		Unrealized Losses
March 31, 2014:
Certificates of deposit	$	9,296	$	(15	)	$	—	$	—	$	9,296	$	(15	)
Commercial paper		11,969		(5	)		—		—		11,969		(5	)
Corporate debt securities		82,745		(182	)		—		—		82,745		(182	)
Securities of government sponsored entities		5,029		(2	)		—		—		5,029		(2	)
Total	$	109,039	$	(204	)	$	—	$	—	$	109,039	$	(204	)
December 31, 2013:
Certificates of deposit	$	9,802	$	(7	)	$	—	$	—	$	9,802	$	(7	)
Corporate debt securities		29,919		(8	)		—		—		29,919		(8	)
Total	$	39,721	$	(15	)	$	—	$	—	$	39,721	$	(15	)