Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Measurements [Abstract]

Schedule of fair value measurement on a recurring basis

June 30, 2019

	Carrying amount				Fair Value Measurement Using
	in balance sheet		Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents
Commercial paper	$	722	$	722	$	722	$	0	$	0
Treasury bills		7,707		7,707		7,707		0		0
Equity Securities		45		45		0		0		45

December 31, 2018

	Carrying amount				Fair Value Measurement Using
	in balance sheet		Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents
Commercial paper	$	667	$	667	$	667	$	0	$	0
Treasury bills		7,697		7,697		7,697		0		0
Equity Securities		45		45		0		0		45

Summary of change in level 3 liabilities at fair value on a recurring basis

	Six Months Ended June 30, 2018
Beginning Balance		$	150
Change in Fair Value			0
Payments			(150	)
Ending Balance		$	0