FAIR VALUE (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Summary of fair value hierarchy for the company's financial assets and liabilities measured at fair value on a recurring basis

The following table represents the Company's fair value hierarchy for its financial assets (cash equivalents and investments) measured at fair value on a recurring basis as of December 31, 2016 (in thousands):

	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	175,344	$	—	$	—	$	175,344
Commercial paper	6,383		—		—		6,383
Auction rate securities	—		—		9,952		9,952
Total assets measured at fair value	$	181,727	$	—	$	9,952	$	191,679

The following table represents the Company's fair value hierarchy for its financial assets (cash equivalents and investments) measured at fair value on a recurring basis as of December 31, 2015 (in thousands):

	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	5,043	$	—	$	—	$	5,043
Commercial paper	11,178		—		—		11,178
Auction rate securities	—		—		15,507		15,507
Total assets measured at fair value	$	16,221	$	—	$	15,507	$	31,728

Summary of changes in the fair value of the company's level 3 assets

The following table summarizes changes in fair value of the Company’s Level 3 assets from December 31, 2014 to December 31, 2016 (in thousands):

	Auction Rate Securities
Balance at December 31, 2014	$	17,151
Decrease in unrealized loss included in accumulated other comprehensive loss	256
Settlements	(1,900		)
Balance at December 31, 2015	15,507
Decrease in unrealized loss included in accumulated other comprehensive loss	395
Settlements	(5,950		)
Balance at December 31, 2016	$	9,952