Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Financial Assets Measured at Fair Value on a Recurring Basis

The following table presents information about our financial assets that have been measured at fair value on a recurring basis as of March 31, 2014 and December 31, 2013, and indicates the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands).



	Fair Value Measurements as of								Amortized Cost as of
	March 31, 2014								March 31, 2014
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash	$	38,266	$	—	$	—	$	38,266	$	38,266
Money market funds	1		20,444		—		20,445		20,445
Corporate notes and bonds	—		72,565		—		72,565		72,565
Total cash and cash equivalents	38,267		93,009		—		131,276		131,276
Short-term investments:
Corporate notes and bonds	—		64,412		—		64,412		64,335
U.S. government agency securities	13,272		677		—		13,949		13,947
Total short-term investments	13,272		65,089		—		78,361		78,282
Restricted cash equivalents and investments	—		3,000		—		3,000		3,000
Equity investment in publicly traded securities	3,212		—		—		3,212		482
Total	$	54,751	$	161,098	$	—	$	215,849	$	213,040



	Fair Value Measurements as of								Amortized Cost as of
	December 31, 2013								December 31, 2013
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash	$	46,978	$	—	$	—	$	46,978	$	46,978
Money market funds	1		26,913		—		26,914		26,914
Corporate notes and bonds	—		77,043		—		77,043		77,044
U.S. government agency securities	—		300		—		300		300
Total cash and cash equivalents	46,979		104,256		—		151,235		151,236
Short-term investments:
Corporate notes and bonds	—		59,766		—		59,766		59,713
U.S. government agency securities	14,077		1,077		—		15,154		15,159
Total short-term investments	14,077		60,843		—		74,920		74,872
Restricted cash equivalents and investments	—		3,000		—		3,000		3,000
Equity investment in publicly traded securities	7,181		—		—		7,181		842
Total	$	68,237	$	168,099	$	—	$	236,336	$	229,950

Schedule of Contractual Maturity Date

Contractual maturities of short-term investments as of March 31, 2014 (in thousands):



	Estimated Fair Value
Within one year	$	45,536
Between one year and five years	32,825
Total short-term investments	$	78,361