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Concentration of Credit Risk
 12 Months Ended
Dec. 31, 2011
Concentration of Credit Risk [Abstract]  
Concentration of Credit Risk
Concentration of Credit Risk
 
The Company has two client payor relationships that individually comprise a significant portion of our net revenue.  The following is a summary of the approximate amounts of the Company’s net revenue and accounts receivable contributed by each of these clients as of and for the years ended December 31:
 
 
2011
 
2010
 
 
Accounts Receivable
 
Revenue
 
% of Total Revenue
 
Accounts Receivable
 
Revenue
 
% of Total Revenue
Client A
 
$
1,689

 
$
16,584

 
34
 %
 
$
2,448

 
$
29,587

 
48
 %
Client B
 
853

 
9,959

 
20

 
1,399

 
16,715

 
27

All other legacy clients
 
1,103

 
10,101

 
21

 
716

 
9,695

 
16

Clients implemented in 2010
 
854

 
11,901

 
24

 
1,310

 
5,899

 
10

Clients implemented in 2011
 
55

 
983

 
2

 
—

 
—

 
nm

Allowance for Uncollectable Receivables/Provision for Refunds
 
(237
)
 
(622
)
 
(1
)
 
(363
)
 
(695
)
 
(1
)
 
 
$
4,317

 
$
48,906

 
100
 %
 
$
5,510

 
$
61,201

 
100
 %

Client A includes five entities and Client B includes two entities, which are aggregated for this presentation.