Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Measurements [Abstract]

Fair Value Measurements on a Recurring Basis

June 30, 2018

	Carrying amount				Fair Value Measurement Using
	in balance sheet		Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents
Commercial paper	$	272	$	272	$	272	$	0	$	0
Treasury bills		7,712		7,712		7,712		0		0
Equity Securities		45		45		0		0		45

December 31, 2017

	Carrying amount				Fair Value Measurement Using
	in balance sheet		Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents
Commercial paper	$	568	$	568	$	568	$	0	$	0
Treasury bills		7,711		7,711		7,711		0		0
Equity Securities		45		45		0		0		45
Liabilities:
Contingent earn-out		150		150		0		0		150

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

	Three Months Ended June 30					Six Months  Ended June 30
		2018		2017			2018			2017
Beginning Balance	$	0	$	195		$	150		$	195
Change in Fair Value		0		(53	)		0			(53	)
Payments		0		0			(150	)		0
Ending Balance	$	0	$	142		$	0		$	142