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

6 Months Ended

Jun. 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 June 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
	(in thousands)
Cash and money market funds	$	143,962	$	—	$	—		$	143,962
Commercial paper		58,443		—		(15	)		58,428
Government and government agency bonds		79,273		—		(19	)		79,254
Corporate bonds		19,306		—		(4	)		19,302
Total assets	$	300,984	$	—	$	(38	)	$	300,946
As reported:
Cash and cash equivalents	$	168,352	$	—	$	(4	)	$	168,348
Short-term investments		132,632		—		(34	)		132,598
Total assets	$	300,984	$	—	$	(38	)	$	300,946

	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