CASH, CASH EQUIVALENTS AND SHORT TERM INVESTMENTS

12 Months Ended

Dec. 31, 2017

Cash Cash Equivalents And Short Term Investments [Abstract]

Cash, Cash Equivalents and Short Term Investments

3.CASH, CASH EQUIVALENTS AND SHORT TERM INVESTMENTS

At December 31, 2017, cash, cash equivalents and short term investments consisted of the following:

			Gross		Gross
			Unrealized		Unrealized			Estimated
	Cost		Gains		Losses			Fair Value
Cash	$	24,454	$	0	$	0		$	24,454
Money market funds		200		0		0			200
Government and agency securities		42,220		135		(355	)		42,000
Corporate debt securities		5,577		28		(37	)		5,568
	$	72,451	$	163	$	(392	)	$	72,222

At December 31, 2016, cash, cash equivalents and short term investments consisted of the following:

			Gross		Gross
			Unrealized		Unrealized			Estimated
	Cost		Gains		Losses			Fair Value
Cash	$	9,166	$	0	$	0		$	9,166
Money market funds		457		0		0			457
Government and agency securities		19,132		51		(96	)		19,087
Corporate debt securities		4,791		18		(23	)		4,786
	$	33,546	$	69	$	(119	)	$	33,496