FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of the fair value hierarchy of the Company's financial assets and liabilities measured at fair value

The following table represents the fair value hierarchy of the Company's financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2019.



	Level 1		Level 2		Total
	(in thousands)
Money market funds	$	1,058	$	—	$	1,058
Certificates of deposit	—		198,663		198,663
Government debt securities	—		232,604		232,604
Corporate debt securities	—		367,051		367,051
Derivative contracts	—		1,056		1,056
Total financial assets	$	1,058	$	799,374	$	800,432

The following table represents the fair value hierarchy of the Company's financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2018.



	Level 1		Level 2		Total
	(in thousands)
Money market funds	$	1,265	$	—	$	1,265
Certificates of deposit	—		95,038		95,038
Government debt securities	—		100,478		100,478
Corporate debt securities	—		186,208		186,208
	1,265		381,724		382,989
Long-term restricted cash	—		7,884		7,884
Derivative contracts	—		96		96
Total financial assets	$	1,265	$	389,704	$	390,969
Derivative contracts	$	—	$	2,536	$	2,536
Total financial liabilities	$	—	$	2,536	$	2,536