Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis are categorized in the tables below based upon the lowest level of significant input to the valuations:



	December 31, 2017
	Level 1		Level 2		Level 3
Assets:
Short-term investments (1)	$	10,997	$	—	$	—
Total	$	10,997	$	—	$	—
Liabilities:
Contingent consideration (2)	$	—	$	—	$	412
Total	$	—	$	—	$	412
	December 31, 2016
	Level 1		Level 2		Level 3
Assets:
Short-term investments (1)	$	42,942	$	—	$	—
Total	$	42,942	$	—	$	—
Liabilities:
Contingent consideration (2)	$	—	$	—	$	2,100
Total	$	—	$	—	$	2,100


(1)	Short-term investments in the accompanying consolidated balance sheets are six-month U.S. Treasury Bills. The fair values of these assets are based on Level 1 inputs in the fair value hierarchy.

(2)

Contingent consideration liability represents arrangements to pay the former owners of certain companies we acquired. For the year ended December 31, 2017, we paid $0.5 million as part of these arrangements. For the year ended December 31, 2016, we paid $0.8 million as part of these arrangements. The remaining change in the fair value of the contingent consideration from December 31, 2016 to December 31, 2017 was related to a $1.3 million decrease due to the expiration of the contingent consideration period for one of our acquisitions and changes in foreign currency exchange rates.