Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information (Unaudited) (Details)

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Quarterly Financial Information (Unaudited) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue $ 1,979,000 $ 1,923,000 $ 2,648,000 $ 1,544,000 $ 1,597,000 $ 1,405,000 $ 1,325,000 $ 1,211,000 $ 8,094,368 $ 5,537,753 $ 2,127,378
Gross profit 300,000 621,000 670,000 177,000 (304,000) (92,000) (429,000) 149,000 1,768,282 (676,598) (1,163,588)
Net loss $ (5,564,000) $ (4,798,000) $ (6,148,000) $ (5,366,000) $ (5,879,000) $ (5,502,000) $ (4,070,000) $ (4,182,000) $ (21,875,713) $ (19,633,502) $ (19,250,082)
Net loss per share, basic and diluted $ (0.22) $ (0.19) $ (0.24) $ (0.22) $ (0.29) $ (0.28) $ (0.22) $ (0.23) $ 0.87 $ 1.02 $ 1.23
Net loss attributable to common stockholders $ (6,033,000) $ (5,260,000) $ (6,599,000) $ (5,804,000) $ (6,321,000) $ (5,938,000) $ (4,494,000) $ (4,595,000) $ (23,695,881) $ (21,348,436) $ (20,870,130)