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Related Party Transactions
9 Months Ended
Sep. 30, 2011
Related Party Transactions [Abstract] 
Related Party Transactions
13. Related Party Transactions
     One of the Company’s investors who purchased shares in several preferred stock investment rounds is also the Company’s Assistant Secretary and primary external legal counsel. Legal fees paid to this investor’s firm totaled $1.7 million and $0.1 million for the three months ended September 30, 2011 and 2010, respectively. Legal fees paid to this firm during the nine months ended September 30, 2011 and 2010 totaled $3.8 million and $1.0 million, respectively. At September 30, 2011 and December 31, 2010, the Company had outstanding payables and accruals to the legal firm of $0.2 million and $0.5 million, respectively.