Annual report pursuant to Section 13 and 15(d)

Select Quarterly Data (Details)

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Select Quarterly Data (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Select Quarterly Data [Abstract]                      
Revenues:
Expenses 4,898,229 4,219,322 4,283,925 3,953,241 3,919,047 3,717,575 3,912,782 4,863,981 17,354,717 16,413,385 18,263,436
Loss from Operations (4,898,229) (4,219,322) (4,283,925) (3,953,241) (3,919,047) (3,717,575) (3,912,782) (4,863,981) (17,354,717) (16,413,385) (18,263,436)
Other Income (Expense), net 1,305,766 3,181,250 5,230,981 (17,657,783) 3,393,564 850,579 2,146,958 714,939 (7,939,786) 7,106,040 3,878,880
Net Income (Loss) $ (3,592,463) $ (1,038,072) $ 947,056 $ (21,611,024) $ (525,483) $ (2,866,996) $ (1,765,824) $ (4,149,042) $ (25,294,503) $ (9,307,345) $ (14,384,556)
Net Income (Loss) per share, basic $ (0.12) $ (0.04) $ 0.04 $ (0.91)              
Net Income (Loss) per share, diluted $ (0.12) $ (0.04) $ 0.03 $ (0.91)              
Net Income (Loss) per share, diluted         $ (0.02) $ (0.13) $ (0.08) $ (0.20) $ (0.92) $ (0.43) $ (0.79)