Annual report pursuant to Section 13 and 15(d)

Unaudited Quarterly Financial Information - Summary of the Company's Unaudited Quarterly Results of Operations (Detail)

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Unaudited Quarterly Financial Information - Summary of the Company's Unaudited Quarterly Results of Operations (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
Quarterly Financial Information Disclosure [Abstract]                    
Revenue $ 434,784 $ 253,374 $ 167,668 $ 176,407 $ 430,582 $ 264,248 $ 256,407 $ 380,527 $ 1,032,233 $ 1,331,764
Total operating expenses 3,428,793 9,465,455 2,156,279 1,848,582 2,014,801 2,196,762 7,012,848 1,661,192 16,899,109 12,885,603
Net loss $ (3,079,335) $ (9,325,424) $ (2,074,035) $ (1,589,960) $ (1,988,826) $ (2,555,941) $ (6,928,771) $ 1,616,908 $ (16,068,754) $ (13,090,446)
Loss per share:                    
Basic and Diluted $ (0.09) $ (0.34) $ (0.08) $ (0.06) $ (0.07) $ (0.11) $ (0.52) $ (0.25) $ (0.56) $ (0.74)