Cash and Investments (Tables)

6 Months Ended

Jun. 30, 2020

Cash And Cash Equivalents [Abstract]

Cash

Cash is carried at cost, which approximates fair market value. Cash consisted of the following:    

	June 30, 2020		December 31, 2019
Cash	$	50,390	$	52,487
Total cash	$	50,390	$	52,487

Short-term Investments

Short-term investments consisted of the following:

	June 30, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Short-term investments:
Bond funds	$	5,084	$	—	$	(61	)	$	5,023
Total short-term investments	$	5,084	$	—	$	(61	)	$	5,023

	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