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Quarterly Financial Data - Unaudited - Quarterly Financial Data (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]                      
Revenue - net $ 288,486us-gaap_Revenues $ 120,046us-gaap_Revenues $ 348,264us-gaap_Revenues $ 566,086us-gaap_Revenues $ 17,242,672us-gaap_Revenues $ 5,554,460us-gaap_Revenues $ 253,745us-gaap_Revenues $ 863,072us-gaap_Revenues $ 1,322,882us-gaap_Revenues $ 23,913,949us-gaap_Revenues $ 13,197,515us-gaap_Revenues
Gross profit 245,915us-gaap_GrossProfit 93,020us-gaap_GrossProfit 290,379us-gaap_GrossProfit 446,481us-gaap_GrossProfit 16,958,243us-gaap_GrossProfit 5,384,887us-gaap_GrossProfit 158,661us-gaap_GrossProfit 717,371us-gaap_GrossProfit      
Net income (loss) $ (5,243,352)us-gaap_ProfitLoss $ (7,415,124)us-gaap_ProfitLoss $ (4,015,881)us-gaap_ProfitLoss $ (9,798,757)us-gaap_ProfitLoss $ 10,751,476us-gaap_ProfitLoss $ (931,393)us-gaap_ProfitLoss $ (10,895,976)us-gaap_ProfitLoss $ (9,665,379)us-gaap_ProfitLoss $ (28,662,488)us-gaap_ProfitLoss $ (14,861,309)us-gaap_ProfitLoss $ (18,184,113)us-gaap_ProfitLoss
Basic and diluted net income (loss) per share $ (0.06)us-gaap_EarningsPerShareBasicAndDiluted $ (0.09)us-gaap_EarningsPerShareBasicAndDiluted $ (0.05)us-gaap_EarningsPerShareBasicAndDiluted $ (0.12)us-gaap_EarningsPerShareBasicAndDiluted $ 0.13us-gaap_EarningsPerShareBasicAndDiluted $ (0.01)us-gaap_EarningsPerShareBasicAndDiluted $ (0.14)us-gaap_EarningsPerShareBasicAndDiluted $ (0.12)us-gaap_EarningsPerShareBasicAndDiluted $ (0.31)us-gaap_EarningsPerShareBasicAndDiluted $ (0.13)us-gaap_EarningsPerShareBasicAndDiluted $ (0.25)us-gaap_EarningsPerShareBasicAndDiluted