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SELECTED QUARTERLY FINANCIAL 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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 4,125,000 $ 4,418,000 $ 4,250,000 $ 3,985,000 $ 4,487,000 $ 5,536,000 $ 4,403,000 $ 4,930,000 $ 16,777,713 $ 19,356,450 $ 20,142,898
Gross profit 3,530,000 3,717,000 3,568,000 3,326,000 3,778,000 4,298,000 3,273,000 3,822,000 14,140,770 15,170,742 15,636,225
Net loss $ (21,427,000) $ (14,665,000) $ (19,677,000) $ (21,156,000) $ (22,836,000) $ (25,016,000) $ (21,094,000) $ (20,929,000) $ (76,925,380) $ (89,875,459) $ (85,077,024)
Loss per common share, basic and diluted (in dollars per shares) $ (.10) $ (.07) $ (.10) $ (0.11) $ (0.12) $ (0.13) $ (0.11) $ (0.11) $ (0.37) $ (0.46) $ (0.49)