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Income taxes
9 Months Ended
Sep. 30, 2011
Income taxes [Abstract] 
Income taxes
10. Income taxes
The Company is subject to both federal and state income tax for the jurisdictions within which it operates, which are primarily focused in Massachusetts. Within these jurisdictions, the Company is open to examination for tax years ended December 31, 2006 through December 31, 2010. However, because we are carrying forward income tax attributes such as NOLs from 2005 and earlier tax years, these attributes can still be audited when utilized on returns filed in the future. The U.S. Internal Revenue Service (IRS) has completed an audit of tax years 2007 and 2008 and has informed us that no adjustments to the federal tax returns as filed will be proposed as a result of the audit.