Cash and Investments (Tables)

9 Months Ended

Sep. 30, 2020

Cash And Cash Equivalents [Abstract]

Short-term Investments

Short-term investments consisted of the following:

	September 30, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Bond funds	$	5,110	$	—	$	(46	)	$	5,064
Total short-term investments	$	5,110	$	—	$	(46	)	$	5,064

	December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Short-term investments:
Bond funds	$	5,012	$	—	$	—	$	5,012
Total short-term investments	$	5,012	$	—	$	—	$	5,012