Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Measurements [Abstract]

Fair Value Measurements on a Recurring Basis

September 30, 2017

	Carrying amount				Fair Value Measurement Using
	in balance sheet		Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents
Commercial paper	$	693	$	693	$	693	$	0	$	0
Treasury bills		7,420		7,420		7,420		0		0
Equity Securities		0		0		0		0		0
Liabilities:
Contingent earn-out		142		142		0		0		142

December 31, 2016

	Carrying amount				Fair Value Measurement Using
	in balance sheet		Fair Value		Level 1		Level 2		Level 3
Assets:
Cash equivalents
Commercial paper	$	348	$	348	$	348	$	0	$	0
Treasury bills		7,427		7,427		7,427		0		0
Equity Securities		0		0		0		0		0
Liabilities:
Contingent earn-out		195		195		0		0		195

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

	Three Months Ended September 30				Nine Months  Ended September 30
		2017		2016	2017			2016
Beginning Balance	$	142	$	383	$	195		$	455
Change in Fair Value		0		0		(53	)		(72	)
Ending Balance	$	142	$	383	$	142		$	383