Annual report pursuant to Section 13 and 15(d)

Income Taxes (Components of Loss Before Provision for Income Taxes) (Details)

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Income Taxes (Components of Loss Before Provision for Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Line Items]                      
Loss before provision for income taxes $ (15,712) $ (2,140) $ (5,442) $ (7,293) $ (5,123) $ (2,668) $ (5,205) $ (3,313) $ (30,587) $ (16,309) $ (8,157)
UNITED STATES
                     
Income Tax Disclosure [Line Items]                      
Loss before provision for income taxes                 (30,743) (17,474) (7,837)
Foreign
                     
Income Tax Disclosure [Line Items]                      
Loss before provision for income taxes                 $ 156 $ 1,165 $ (320)