CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2017

Cash And Cash Equivalents [Abstract]

Summary of Company Cash, Cash Equivalents and Short-Term Investments

The following tables summarize the Company’s cash, cash equivalents and short-term investments for each of the periods indicated:

	As of September 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	(in thousands)
Cash and money market funds	$	420,190	$	—	$	—		$	420,190
Commercial paper		83,516		—		(10	)		83,506
Government and government agency bonds		113,936		1		(3	)		113,934
Total assets	$	617,642	$	1	$	(13	)	$	617,630
As reported:
Cash and cash equivalents	$	617,642	$	1	$	(13	)	$	617,630
Total assets	$	617,642	$	1	$	(13	)	$	617,630

	As of December 31, 2016
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	(in thousands)
Cash and money market funds	$	122,420	$	—	$	—		$	122,420
Commercial paper		69,355		—		(51	)		69,304
Government and government agency bonds		105,340		—		(53	)		105,287
Corporate bonds		20,850		—		(16	)		20,834
Total assets	$	317,965	$	—	$	(120	)	$	317,845
As reported:
Cash and cash equivalents	$	122,420	$	—	$	—		$	122,420
Short-term investments		195,545		—		(120	)		195,425
Total assets	$	317,965	$	—	$	(120	)	$	317,845