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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The estimated fair values as of December 31, 2017 and 2016 were as follows (in thousands):
Assets/(Liabilities) Measured at Fair Value:
Asset/(Liability)
 
Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
 
Significant
Other
Observable
Inputs (Level 2)
 
Significant
Unobservable
Inputs (Level 3)
As of December 31, 2017
 
 
 
 
 
 
 
Recurring basis:
 
 
 
 
 
 
 
Interest rate swap derivative instrument
$
479

 
$
—

 
$
479

 
$
—

Contingent consideration liability
$
(191
)
 
$
—

 
$
—

 
$
(191
)
As of December 31, 2016
 
 
 
 
 
 
 
Recurring basis:
 
 
 
 
 
 
 
Contingent consideration liability
$
(756
)
 
$
—

 
$
—

 
$
(756
)