Nature of Business and Basis of Presentation (Details)	Jun. 30, 2020 USD ($) product $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Nature of Business and Basis of Presentation
Number of late-stage candidates in Company's product candidate portfolio | product	5
Common stock, shares authorized | shares	150,000,000	150,000,000
Common stock, par value | $ / shares	$ 0.0001	$ 0.0001
Preferred stock, shares authorized | shares	10,000,000	10,000,000
Preferred stock, par value | $ / shares	$ 0.0001	$ 0.0001
Accumulated deficit | $	$ 226,706,631	$ 175,895,493