Summary of Significant Accounting Policies - Revenue Recognition - Collaboration Revenue (Details) - USD ($)				12 Months Ended
	Sep. 24, 2018	Nov. 01, 2017	Jan. 27, 2017	Dec. 31, 2018	Dec. 31, 2017
Collaboration Revenue
Written notice period (in days)		90 days
Revenues				$ 4,416,145	$ 4,361,186
Elanco
Collaboration Revenue
Non-refundable upfront payment received			$ 2,548,689
Product and development expense			$ 1,048,689
Estimated development period for revenue recognition (in years)				1 year
Collaboration revenue				$ 177,389	$ 2,876,071
Knight
Collaboration Revenue
License agreement term (in years)	15 years
Transfer price receivable upon achievement of certain regulatory and sales milestones	$ 18,000,000
Revenues				$ 0