Annual report pursuant to Section 13 and 15(d)

Selected quarterly financial information (Details)

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Selected quarterly financial information (Details) (USD $)
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
Selected quarterly financial information [Abstract]                      
Total revenues    $ 56,000       $ 2,000 $ 6,000 $ 27,000 $ 7,000 $ 56,068 $ 41,557 $ 219,420
Gross margin    35,000       1,000 6,000 27,000 7,000 34,875 40,965 203,075
Net loss $ (3,130,000) $ (3,072,000) $ (3,145,000) $ (2,802,000) $ (2,504,000) $ (2,460,000) $ (2,310,000) $ (1,938,000) $ (12,148,655) $ (9,212,215) $ (10,213,801)
Loss per share - Basic and diluted $ (0.15) $ (0.14) $ (0.21) $ (0.28) $ (0.87) $ (0.32) $ (1.19) $ (1.21) $ (0.72) $ (1.84) $ (7.61)
Market price of common stock, high $ 2.14 $ 2.16 $ 2.13 $ 2.74 $ 2.93 $ 2.77 $ 4.44 $ 5.88      
Market price of common stock, low $ 1.57 $ 1.26 $ 1.20 $ 1.99 $ 2.04 $ 1.33 $ 1.88 $ 3.90