CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)

6 Months Ended

Jun. 30, 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 unaudited condensed consolidated balance sheets for each of the periods indicated:

	As of June 30, 2018		As of December 31, 2017
	(in thousands)
Money market funds	$	211,197	$	352,370
Corporate bonds		14,959		16,720
Government and government agency bonds		—		49,972
Total	$	226,156	$	419,062

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, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	(in thousands)
Cash and money market funds	$	395,416	$	—	$	—			395,416
Commercial paper		189,622		—		—			189,622
Government and government agency bonds		278,680		5		(173	)		278,512
Corporate bonds		85,787		—		(193	)		85,594
Total	$	949,505	$	5	$	(366	)		949,144
As reported:
Cash and cash equivalents	$	410,375	$	—	$	—			410,375
Short-term investments		539,130		5		(366	)		538,769
Total	$	949,505	$	5	$	(366	)		949,144

	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 - current		133,368		—		—			133,368
Government and government agency bonds - current		294,915		2		(200	)		294,717
Corporate bonds
Current		118,121		—		(145	)		117,976
Non-current		10,016		—		(36	)		9,980
Total	$	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	$	1,089,419	$	2	$	(381	)	$	1,089,040