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Quarterly Financial Data - Summary of Quarterly Financial Data (Detail) (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
Income Statement [Abstract]                      
Total revenue $ 313,000 $ 325,000 $ 282,000 $ 284,000 $ 211,000 $ 264,000 $ 249,000 $ 644,000 $ 1,203,270 $ 1,367,955 $ 1,220,670
Cost of Sales 86,000 86,000 78,000 67,000 55,000 72,000 64,000 72,000 316,628 263,188 214,811
Operating expenses 9,697,000 6,895,000 6,425,000 6,475,000 6,949,000 5,269,000 5,534,000 5,898,000 29,492,087 23,650,443 29,082,222
Other income (expense), net 2,508,000 (536,000) 353,000 (159,000) 4,034,000 (11,260,000) 6,183,000 (4,903,000) 68,497 33,693 109,404
Net income (loss) $ (6,962,000) $ (7,192,000) $ (5,869,000) $ (6,416,000) $ (2,758,000) $ (16,337,000) $ 833,000 $ (10,229,000) $ (26,439,159) $ (28,491,153) $ (21,328,538)
Basic and diluted net income (loss) per share $ (0.13) $ (0.17) $ (0.15) $ (0.17) $ (0.07) $ (0.54) $ 0.03 $ (0.45) $ (0.61) $ (0.99) $ (1.50)