CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2019

Cash And Cash Equivalents [Abstract]

Schedule of Cash, Cash Equivalents

The following table provides details regarding the Company’s portfolio of cash and cash equivalents (in thousands):

	Amortized		Unrealized				Aggregate Fair
Cash and Cash Equivalents Classification	Cost		Gains		(Losses)		Market Value
September 30, 2019
Cash accounts in banking institutions	$	72,536	$	—	$	—	$	72,536
Money market accounts		11,230		—		—		11,230
U.S. Government bonds		151,748		27		—		151,775
	$	235,514	$	27	$	—	$	235,541
December 31, 2018
Cash accounts in banking institutions	$	71,217	$	—	$	—	$	71,217
Money market accounts		11,014		—		—		11,014
U.S. Government bonds		128,782		9		—		128,791
	$	211,013	$	9	$	—	$	211,022

Schedule of Short-Term Investments

The following table provides details regarding the Company’s portfolio of short-term investments (in thousands):

	Amortized		Unrealized					Aggregate Fair
Short-term Investments Classification	Cost		Gains		(Losses)			Market Value
September 30, 2019
Certificates of deposit	$	800	$	—	$	—		$	800
U.S. Government bonds		360,564		151		—			360,715
	$	361,364	$	151	$	—		$	361,515
December 31, 2018
Certificates of deposit	$	500	$	—	$	(1	)	$	499
Corporate bonds		114,678		1		(19	)		114,660
U.S. Government bonds		189,202		5		(43	)		189,164
	$	304,380	$	6	$	(63	)	$	304,323