Nature of Business and Plan of Operations (Details) shares in Millions, $ in Millions		1 Months Ended
	Oct. 11, 2017 USD ($) shares	Aug. 31, 2017 USD ($) item
Collaborative Agreements disclosures
Issuance of common stock through a public offering (in shares) | shares	16.7
Proceeds from common stock issuance, net	$ 101.6
Jazz
Collaborative Agreements disclosures
Upfront payments received under collaboration agreement		$ 75.0
Potential milestone payments		$ 100.0
Term of agreement		7 years
Number of ADC programs | item		3