Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets Measured on Recurring Basis

The following table sets forth the fair value of our financial assets, allocated into Level 1, Level 2 and Level 3, that were measured on a recurring basis (in thousands):

	September 30, 2016
	Level 1		Level 2		Level 3		Total
Financial Assets:
Money market funds	$	3,003	$	—	$	—	$	3,003
Corporate notes and commercial paper	—			162,819		—		162,819
U.S. government agency securities		—		77,236		—		77,236
Total financial assets	$	3,003	$	240,055	$	—	$	243,058
	December 31, 2015
	Level 1		Level 2		Level 3		Total
Financial Assets:
Money market funds	$	22,074	$	—	$	—	$	22,074
Corporate notes and commercial paper		—		242,033		—		242,033
U.S. government agency securities		—		180,876		—		180,876
Total financial assets	$	22,074	$	422,909	$	—	$	444,983