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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Unaudited [Abstract]                      
Revenue $ 1,953,000 $ 1,159,000 $ 2,186,000 $ 1,373,000 $ 1,979,000 $ 1,923,000 $ 2,648,000 $ 1,544,000 $ 6,670,604 $ 8,094,368 $ 5,537,753
Gross profit (4,369,000) (231,000) 152,000 40,000 300,000 621,000 670,000 177,000 (4,408,121) 1,768,282 (676,598)
Net loss $ (9,583,000) $ (5,477,000) $ (5,056,000) $ (6,360,000) $ (5,564,000) $ (4,798,000) $ (6,148,000) $ (5,366,000) $ (26,476,370) $ (21,875,713) $ (19,633,502)
Net loss per share, basic and diluted $ (0.31) $ (0.18) $ (0.20) $ (0.25) $ (0.22) $ (0.19) $ (0.24) $ (0.22) $ 0.94 $ 0.87 $ 1.02
Net loss attributable to common stockholders $ (10,081,000) $ (5,967,000) $ (5,534,000) $ (6,826,000) $ (6,033,000) $ (5,260,000) $ (6,599,000) $ (5,804,000) $ (28,408,230) $ (23,695,881) $ (21,348,436)