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Accounts Receivable, net
9 Months Ended
Sep. 30, 2011
Accounts Receivable, net
(2)
Accounts Receivable, net
 
The Company had an accounts receivable allowance for doubtful accounts of $0.1 and $0.5 million at September 30, 2011 and December 31, 2010.  The reduction in allowance of $0.4 million was attributable to accounts receivable written off during the nine months ended September 30, 2011, as the Company ceased its collection efforts of certain previously reserved accounts.  Bad debt expense for the three months ended September 30, 2011 and 2010 was zero.  Bad debt expense for the nine months ended September 30, 2011 and 2010 was $0.1 million and zero, respectively.

Included in accounts receivable was retainage associated with construction projects of zero and $1.1 million at September 30, 2011 and December 31, 2010, respectively.

The Company earned approximately 27 % and 74% of its revenue from two customers for the three months ended September 30, 2011 and 2010, respectively.  The Company earned approximately 39% and 72% of its revenue from two customers for the nine months ended September 30, 2011 and 2010, respectively. Accounts receivable from these customers at September 30, 2011 and December 31, 2010 was $1.0 million and $1.2 million, respectively.