Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (Details)

v2.4.1.9
Selected Quarterly Financial Data (Details) (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
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 1,460,000us-gaap_SalesRevenueNet $ 1,101,000us-gaap_SalesRevenueNet $ 1,046,000us-gaap_SalesRevenueNet $ 627,000us-gaap_SalesRevenueNet $ 343,000us-gaap_SalesRevenueNet $ 144,000us-gaap_SalesRevenueNet $ 128,000us-gaap_SalesRevenueNet $ 0us-gaap_SalesRevenueNet $ 4,233,953us-gaap_SalesRevenueNet $ 614,423us-gaap_SalesRevenueNet $ 0us-gaap_SalesRevenueNet
Grant and other revenue 738,000us-gaap_RevenueFromGrants 1,149,000us-gaap_RevenueFromGrants 28,000us-gaap_RevenueFromGrants 125,000us-gaap_RevenueFromGrants 192,000us-gaap_RevenueFromGrants 257,000us-gaap_RevenueFromGrants 67,000us-gaap_RevenueFromGrants 0us-gaap_RevenueFromGrants 1,740,896us-gaap_RevenueFromGrants 516,207us-gaap_RevenueFromGrants 78,738us-gaap_RevenueFromGrants
Gross profit 1,884,000us-gaap_GrossProfit 1,442,000us-gaap_GrossProfit 804,000us-gaap_GrossProfit 559,000us-gaap_GrossProfit 383,000us-gaap_GrossProfit 325,000us-gaap_GrossProfit 90,000us-gaap_GrossProfit 0us-gaap_GrossProfit 4,688,704us-gaap_GrossProfit 797,815us-gaap_GrossProfit 78,738us-gaap_GrossProfit
Operating expenses 6,360,000us-gaap_OperatingExpenses 6,805,000us-gaap_OperatingExpenses 10,020,000us-gaap_OperatingExpenses 9,138,000us-gaap_OperatingExpenses 13,436,000us-gaap_OperatingExpenses 10,250,000us-gaap_OperatingExpenses 8,546,000us-gaap_OperatingExpenses 7,004,000us-gaap_OperatingExpenses 32,321,660us-gaap_OperatingExpenses 39,236,129us-gaap_OperatingExpenses 28,068,041us-gaap_OperatingExpenses
Operating loss (4,476,000)us-gaap_OperatingIncomeLoss (5,362,000)us-gaap_OperatingIncomeLoss (9,216,000)us-gaap_OperatingIncomeLoss (8,579,000)us-gaap_OperatingIncomeLoss (13,053,000)us-gaap_OperatingIncomeLoss (9,925,000)us-gaap_OperatingIncomeLoss (8,456,000)us-gaap_OperatingIncomeLoss (7,004,000)us-gaap_OperatingIncomeLoss (27,632,956)us-gaap_OperatingIncomeLoss (38,438,314)us-gaap_OperatingIncomeLoss (27,989,303)us-gaap_OperatingIncomeLoss
Net loss attributable to common stockholders $ (6,865,000)us-gaap_NetIncomeLoss $ (6,899,000)us-gaap_NetIncomeLoss $ (10,222,000)us-gaap_NetIncomeLoss $ (11,741,000)us-gaap_NetIncomeLoss $ (13,752,000)us-gaap_NetIncomeLoss $ (11,306,000)us-gaap_NetIncomeLoss $ (10,300,000)us-gaap_NetIncomeLoss $ (7,341,000)us-gaap_NetIncomeLoss $ (35,726,669)us-gaap_NetIncomeLoss $ (42,699,458)us-gaap_NetIncomeLoss $ (29,157,204)us-gaap_NetIncomeLoss
Basic and diluted net loss per share, in dollars per share $ (0.05)us-gaap_EarningsPerShareBasicAndDiluted $ (0.05)us-gaap_EarningsPerShareBasicAndDiluted $ (0.07)us-gaap_EarningsPerShareBasicAndDiluted $ (0.08)us-gaap_EarningsPerShareBasicAndDiluted $ (0.10)us-gaap_EarningsPerShareBasicAndDiluted $ (0.09)us-gaap_EarningsPerShareBasicAndDiluted $ (0.09)us-gaap_EarningsPerShareBasicAndDiluted $ (0.06)us-gaap_EarningsPerShareBasicAndDiluted $ (0.24)us-gaap_EarningsPerShareBasicAndDiluted $ (0.35)us-gaap_EarningsPerShareBasicAndDiluted $ (0.29)us-gaap_EarningsPerShareBasicAndDiluted