Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Assets and Liabilities Measured on Recurring Basis

The composition of our financial assets and liabilities within the fair value hierarchy are as follows (in thousands):

	September 30, 2017
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market funds	$	262,759	$	—	$	—	$	262,759
Corporate debt securities		—		86,659		—		86,659
Short-term investments:
Corporate debt securities		—		254,972		—		254,972
Total financial assets	$	262,759	$	341,631	$	—	$	604,390
Liabilities:
Contingent consideration	$	—	$	—	$	—	$	—

	December 31, 2016
	Level 1		Level 2		Level 3		Total
Assets:
Cash and cash equivalents:
Money market funds	$	439,330	$	—	$	—	$	439,330
U.S. government and government agency debt securities		—		19,987		—		19,987
Corporate debt securities		—		269,767		—		269,767
Total financial assets	$	439,330	$	289,754	$	—	$	729,084
Liabilities:
Contingent consideration	$	—	$	—	$	901	$	901

Fair Value Liabilities Measured on Recurring Basis

The following table presents the activity for the nine months ended September 30, 2017 related to our Level 3 liabilities (in thousands):

Level 3 Liabilities:	Zindagi			PuzzleSocial			Total
Contingent consideration liability –  December 31, 2016	$	180		$	721		$	901
Fair value adjustments		(180	)		(721	)		(901	)
Contingent consideration liability –  September 30, 2017	$	—		$	—		$	—