CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)

6 Months Ended

Jun. 30, 2019

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 unaudited condensed consolidated balance sheets for each of the periods indicated:

	As of June 30, 2019		As of December 31, 2018
	(in thousands)
Money market funds	$	181,040	$	42,920
Government and government agency bonds		452,506		111,587
Commercial paper		37,610		14,940
Total	$	671,156	$	169,447

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 June 30, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Cash and money market funds	$	318,475	$	—	$	—		$	318,475
Commercial paper		87,370		—		—			87,370
Government and government agency bonds		677,166		91		(15	)		677,242
Corporate bonds		19,976		6		—			19,982
Total cash, cash equivalents and short-term investments	$	1,102,987	$	97	$	(15	)	$	1,103,069
As reported:
Cash and cash equivalents	$	808,562	$	34	$	(5	)	$	808,591
Short-term investments		294,425		63		(10	)		294,478
Total cash, cash equivalents and short-term investments	$	1,102,987	$	97	$	(15	)	$	1,103,069

	As of December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair 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 short-term 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 short-term investments	$	1,174,011	$	12	$	(111	)	$	1,173,912