Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Financial Assets Measured at Fair Value on a Recurring Basis

The following tables present information about our financial assets that have been measured at fair value on a recurring basis as of December 31, 2013 and December 31, 2012, and indicates the fair value hierarchy of the valuation inputs utilized to determine fair value (in thousands).



	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 investments in publicly traded securities	7,181		—		—		7,181		842
Total	$	68,237	$	168,099	$	—	$	236,336	$	229,950



	Fair Value Measurements as of								Amortized Cost as of
	December 31, 2012								December 31, 2012
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash	$	71,283	$	—	$	—	$	71,283	$	71,283
Money market funds	—		10,680		—		10,680		10,680
Corporate notes and bonds	—		81,235		—		81,235		81,237
Total cash and cash equivalents	71,283		91,915		—		163,198		163,200
Short-term investments:
Corporate notes and bonds	—		65,502		—		65,502		65,426
U.S. government agency securities	42,113		601		—		42,714		42,693
Total short-term investments	42,113		66,103		—		108,216		108,119
Restricted cash equivalents and investments	—		10,000		—		10,000		10,000
Equity investments in publicly traded securities	34,334		—		—		34,334		8,609
Total	$	147,730	$	168,018	$	—	$	315,748	$	289,928

Contractual Maturities of Short-term Investments

Contractual maturities of short-term investments as of December 31, 2013 (in thousands):



	Estimated Fair Value
Within one year	$	47,693
Between one year and five years	27,227
Total short-term investments	$	74,920