CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2018

Cash And Cash Equivalents [Abstract]

Summary of Company Financial Assets with Maturities of Less Than 90 Days Included in Cash Equivalents

The following table summarizes the Company’s financial assets with maturities of less than 90 days from the date of purchase included in cash equivalents in the consolidated balance sheets for each of the periods indicated:

	As of December 31
	2018		2017
	(in thousands)
Money market funds	$	42,920	$	352,370
Corporate bonds		—		16,720
Government and government agency bonds		111,587		49,972
Commercial paper		14,940		—
Total	$	169,447	$	419,062

Summary of Company Cash, Cash Equivalents and Investments

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

	As of December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	(in thousands)
Cash and money market funds	$	244,302	$	—	$	—		$	244,302
Commercial paper		125,907		—		—			125,907
Government and government agency bonds		760,258		12		(35	)		760,235
Corporate bonds		43,544		—		(76	)		43,468
Total cash, cash equivalents and investments		1,174,011		12		(111	)		1,173,912
As reported:
Cash and cash equivalents	$	370,827	$	3	$	(1	)	$	370,829
Short-term investments		803,184		9		(110	)		803,083
Total cash, cash equivalents and investments	$	1,174,011	$	12	$	(111	)	$	1,173,912
	As of December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	(in thousands)
Cash and money market funds	$	532,999	$	—	$	—		$	532,999
Commercial paper		133,368		—		—			133,368
Government and government agency bonds		294,915		2		(200	)		294,717
Corporate bonds
Current		118,121		—		(145	)		117,976
Non-current		10,016		—		(36	)		9,980
Total cash, cash equivalents and investments		1,089,419		2		(381	)		1,089,040
As reported:
Cash and cash equivalents	$	599,698	$	2	$	(9	)	$	599,691
Short-term investments		479,705		—		(336	)		479,369
Long-term investments	$	10,016	$	—	$	(36	)	$	9,980
Total cash, cash equivalents and investments	$	1,089,419	$	2	$	(381	)	$	1,089,040