Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Fair Value of Assets and Liabilities

The following table presents our financial assets and liabilities measured and recorded at fair value on a recurring basis using the above input categories (in thousands):



	As of December 31, 2015								As of December 31, 2014
Description	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	210,533	$	—	$	—	$	210,533	$	13,069	$	—	$	—	$	13,069
U.S. Government agencies	—		—		—		—		—		12,950		—		12,950
Total cash equivalents	$	210,533	$	—	$	—	$	210,533	$	13,069	$	12,950	$	—	$	26,019
Short-term investments:
Certificates of deposit	—		19,124		—		19,124		—		4,994		—		4,994
Corporate notes and bonds	—		447,267		—		447,267		—		142,984		—		142,984
U.S. Government agencies	—		301,384		—		301,384		—		107,867		—		107,867
Total short-term investments	$	—	$	767,775	$	—	$	767,775	$	—	$	255,845	$	—	$	255,845
Total assets measured at fair value	$	210,533	$	767,775	$	—	$	978,308	$	13,069	$	268,795	$	—	$	281,864