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Fair Value Measurement (Tables)
 6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Financial liabilities measured at fair value on a recurring basis
 
June 30, 2016
 
Level 1
 
Level 2
 
Level 3
 
Fair Value
Contingent purchase obligation related to acquisitions
$
—

 
$
—

 
$
4,211

 
$
4,211

Total liabilities at fair value
$
—

 
$
—

 
$
4,211

 
$
4,211

 
December 31, 2015
 
Level 1
 
Level 2
 
Level 3
 
Fair Value
Contingent purchase obligation related to acquisitions
$
—

 
$
—

 
$
4,913

 
$
4,913

Total liabilities at fair value
$
—

 
$
—

 
$
4,913

 
$
4,913
Schedule of reconciliation of beginning and ending Level 3 financial liability balance
The table below sets forth a reconciliation of the Company’s beginning and ending Level 3 financial liability balance for the three and six months ended June 30, 2016 and 2015 (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Balance, beginning of period
$
4,913

 
$
4,782

 
$
4,913

 
$
6,842

Payments of contingent purchase obligations
(798
)
 
(1,411
)
 
(798
)
 
(3,317
)
Interest expense
96

 
58

 
96

 
148

Adjustments to contingent purchase obligations (1)
—

 
53

 
—

 
(191
)
Balance, end of period
$
4,211

 
$
3,482

 
$
4,211

 
$
3,482

(1)
Adjustments to contingent purchase obligations are reported in other operating expenses in the condensed consolidated statements of operations.