Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)		3 Months Ended		9 Months Ended
	Aug. 14, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenue		$ 4,074,786	$ 25,037,592	$ 13,342,699	$ 25,579,597
Prescribed dietary supplements
Disaggregation of Revenue [Line Items]
Total revenue		2,096,851	0	5,766,642	0
Prescription drugs
Disaggregation of Revenue [Line Items]
Total revenue		1,977,935	0	7,279,182	0
Sales force revenue
Disaggregation of Revenue [Line Items]
Total revenue		0	0	296,875	0
License and other revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 25,000,000	0	25,000,000	0	25,000,000
Grant revenue
Disaggregation of Revenue [Line Items]
Total revenue		$ 0	$ 37,592	$ 0	$ 579,597