FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2019:



	Level 1		Level 2		Total
	(in thousands)
Money market funds	$	4,048	$	—	$	4,048
Certificates of deposit	—		149,108		149,108
Government debt securities	—		150,144		150,144
Corporate debt securities	—		257,554		257,554
	4,048		556,806		560,854
Derivative contracts	—		706		706
Total financial assets	$	4,048	$	557,512	$	561,560
Derivative contracts	—		22		22
Total financial liabilities	$	—	$	22	$	22

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