Fair value measurements (Tables)
 12 Months Ended
Dec. 31, 2013
Fair value measurements [Abstract]  
Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
  The following table represents the Company's fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis:

 
At December 31, 2013
 
(in thousands)
 
Level 1
  
Level 2
  
Level 3
  
Total
 
Assets:
 
  
  
  
 
Investment in money market funds (1)
 
$
37,701
  
$
-
  
$
-
  
$
37,701
 
Total assets
 
$
37,701
  
$
-
  
$
-
  
$
37,701
 
 
                
Liabilities:
                
Contingent purchase consideration
 
$
-
  
$
-
  
$
16,619
  
$
16,619
 
Total liabilities
 
$
-
  
$
-
  
$
16,619
  
$
16,619
 
 
                
 
At December 31, 2012
 
(in thousands)
 
Level 1
  
Level 2
  
Level 3
  
Total
 
Assets:
                
Investment in money market funds (1)
 
$
42,720
  
$
-
  
$
-
  
$
42,720
 
Total assets
 
$
42,720
  
$
-
  
$
-
  
$
42,720
 

(1) Included in cash and cash equivalents in accompanying consolidated balance sheets.
Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)

The following table is a reconciliation of the beginning and ending balance of the liabilities measured at fair value using significant unobservable inputs (Level 3) during the years ended December 31, 2013 and 2012.
(in thousands)
 
 
Balance at December 31, 2011
 
$
4,753
 
Expense (income) included in earnings
  
(3,005
)
Settlements
  
(1,748
)
Purchases, sales and issuances
  
-
 
Transfers in/(out) of Level 3
  
-
 
Balance at December 31, 2012
 
$
-
 
Expense (income) included in earnings
  
735
 
Settlements
  
(348
)
Purchases, sales and issuances
  
16,232
 
Transfers in/(out) of Level 3
  
-
 
Balance at December 31, 2013
 
$
16,619