Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Measurements [Abstract]

Summary Of Assets And Liabilities Measured At Fair Value On Recurring Basis

	Fair Value Measurements as of December 31, 2017
(in thousands)		Level 1		Level 2		Level 3		Total
Description
Cash equivalents (a)	$	20,244	$	—	$	—	$	20,244
Earnout consideration (b)	$	—	$	—	$	5,115	$	5,115
	Fair Value Measurements as of December 31, 2016
(in thousands)		Level 1		Level 2		Level 3		Total
Description
Cash equivalents (a)	$	25,206	$	—	$	—	$	25,206
Earnout consideration (b)	$	—	$	—	$	10,806	$	10,806

^(a) Cash equivalents include funds held in money market instruments and are reported at their current carrying value, which approximates fair value due to the short-term nature of these instruments and are included in cash and cash equivalents in the consolidated balance sheet.

^(b) The fair value of the earnout consideration, which is based on the present value of the expected future payments to be made to the sellers of the acquired businesses, was derived by analyzing the future performance of the acquired businesses using the earnout formula and performance targets specified in each purchase agreement and adjusting those amounts to reflect the ability of the acquired entities to achieve the stated targets. Given the significance of the unobservable inputs, the valuations are classified in Level 3 of the fair value hierarchy. The change in earnout consideration from December 31, 2016 to December 31, 2017 reflects a payment of $3,206, accretion of $921 and adjustments of $3,406.