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Quarterly Financial Data - Unaudited - Quarterly Financial Data (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]                      
Revenue - net   $ 2,883,240 $ 1,217,318 $ 582,477 $ 3,312,763 $ 1,458,653 $ 443,543 $ 115,292 $ 4,683,035 $ 5,330,251 $ 1,322,882
Gross profit   2,883,240 1,217,318 582,477 3,116,411 585,136 278,957 (97,584)      
Net income (loss) $ (2,409,584) $ (2,132,303) $ (1,858,778) $ 84,644 $ 2,213,781 $ (4,580,255) $ (6,126,218) $ (9,714,471) $ (9,078,075) $ (21,251,245) $ (28,662,488)
Basic and diluted net income per share $ (0.32) $ (0.28) $ (0.25) $ 0.01 $ 0.33 $ (0.61) $ (0.85) $ (1.33) $ (0.84) $ (2.46) $ (3.74)