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Quarterly Financial Data - Unaudited - 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
Selected Quarterly Financial Information [Abstract]                      
Revenue-net $ 17,242,672 $ 5,554,460 $ 253,745 $ 863,072 $ 7,925,035 $ 946,097 $ 1,426,631 $ 2,899,752 $ 23,913,949 $ 13,197,515 $ 15,727,232
Gross profit 16,958,243 5,384,887 158,661 717,371 7,867,816 891,860 1,336,739 2,865,563      
Net income (loss) $ 10,751,476 $ (931,393) $ (10,895,976) $ (9,665,379) $ (914,947) $ 3,802,983 $ (15,590,350) $ (5,481,799) $ (10,741,272) $ (18,184,113) $ (16,225,308)
Basic and diluted net income per share $ 0.13 $ (0.01) $ (0.14) $ (0.12) $ (0.01) $ 0.05 $ (0.21) $ (0.08) $ (0.13) $ (0.25) $ (0.28)