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Quarterly Financial Data - Unaudited - Quarterly Financial Data (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]                      
Revenue - net $ 3,312,763 $ 1,458,653 $ 443,543 $ 115,292 $ 288,486 $ 120,046 $ 348,264 $ 566,086 $ 5,330,251 $ 1,322,882 $ 23,913,949
Gross profit 3,116,411 585,136 278,957 (97,584) 245,915 93,020 290,379 446,481      
Net income (loss) $ 2,213,781 $ (4,580,255) $ (6,126,218) $ (9,714,471) $ (5,243,352) $ (7,415,124) $ (4,015,881) $ (9,798,757) $ (21,251,245) $ (28,662,488) $ (14,861,309)
Basic and diluted net income per share $ 0.33 $ (0.61) $ (0.85) $ (1.33) $ (0.72) $ (1.08) $ (0.60) $ (1.44) $ (2.46) $ (3.74) $ (1.61)