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Balance Sheet Components
 9 Months Ended
Sep. 30, 2015
Balance Sheet Components [Abstract]  
Balance Sheet Components
6. Balance Sheet Components
 
 
September 30,
2015
 
December 31,
2014
 
 
(in thousands)
 
Accounts receivable:
 
 
Accounts receivable
 
$
74,716
  
$
82,994
 
Unbilled revenues
  
38,012
   
31,845
 
Allowance for doubtful accounts
  
(834
)
  
(911
)
Total
 
$
111,894
  
$
113,928
 

 Property and equipment:
 
  
 
Computer hardware (useful life of 3 years)
 
$
11,045
  
$
10,221
 
Furniture and fixtures (useful life of 5 years)
  
2,948
   
2,442
 
Leasehold improvements (useful life of 5 years)
  
2,484
   
2,075
 
Software (useful life of 1 to 7 years)
  
7,797
   
6,828
 
Less: Accumulated depreciation
  
(16,234
)
  
(13,600
)
Total
 
$
8,040
  
$
7,966
 

 Other current liabilities:
 
  
 
Accrued variable compensation
 
$
9,091
  
$
15,060
 
Deferred revenue
  
4,070
   
5,945
 
Payroll related costs
  
2,057
   
1,614
 
Accrued subcontractor fees
  
1,407
   
871
 
Accrued medical claims expense
  
1,767
   
1,615
 
Acquired liabilities
  
1,495
   
2,603
 
Estimated fair value of contingent consideration liability (1)
  
3,491
   
-
 
Other current liabilities
  
4,506
   
5,320
 
Total
 
$
27,884
  
$
33,028
 
 
(1) Represents the fair value estimate of additional earnings-based contingent consideration that may be realized by Zeon's and Market Street's selling shareholders 12 months after the applicable acquisition.