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Segment Information (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting [Abstract]                      
Number of reportable segments | segment                 2    
Segment Reporting Information [Line Items]                      
Total revenue $ 163,067 $ 250,991 $ 245,502 $ 178,582 $ 282,828 $ 413,601 $ 335,523 $ 242,547 $ 838,142 $ 1,274,499 $ 1,010,663
Loss from operations 2,021,139 2,666,583 9,103,681 8,282,820 8,092,960 9,409,452 8,876,965 8,346,249 22,074,223 34,725,626 39,886,232
Interest income, net $ 12,394 $ 28,210 $ 51,809 $ 59,593 $ 64,429 $ 77,339 $ 72,342 $ 77,854 152,006 291,964 393,109
Operating Segments | Consumer Operations                      
Segment Reporting Information [Line Items]                      
Total revenue                 838,142 1,274,499 1,010,663
Loss from operations                 1,975,792 8,877,330 10,023,137
Interest income, net                 0 0 0
Operating Segments | Drug Development                      
Segment Reporting Information [Line Items]                      
Total revenue                 0 0 0
Loss from operations                 11,887,108 16,715,752 19,620,338
Interest income, net                 0 0 0
Corporate                      
Segment Reporting Information [Line Items]                      
Total revenue                 0 0 0
Loss from operations                 8,211,323 9,132,544 10,242,757
Interest income, net                 $ 152,006 $ 291,964 $ 393,109