Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Details)

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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information [Line Items]                      
Total revenue $ 911 $ 2,198 $ 2,198 $ 5,174 $ 3,259 $ 1,228 $ 1,360 $ 1,270 $ 10,481 $ 7,117 $ 4,068
Net income (loss) $ (209) $ (1,145) $ 5,064 $ 6,001 $ (280) $ (8,013) $ (1,724) $ (5,163) $ 9,711 $ (15,180) $ (15,203)
Basic net income (loss) per share $ 0.00 $ (0.01) $ 0.06 $ 0.08 $ 0.00 $ (0.12) $ (0.03) $ (0.09) $ 0.12 $ (0.23) $ (0.26)
Diluted net income (loss) per share $ 0.00 $ (0.01) $ 0.00 $ 0.07 $ 0.00 $ (0.12) $ (0.06) $ (0.09) $ 0.10 $ (0.23) $ (0.28)