License Agreements and Grants - National Institute of Health Grant (Details) - National Institute of Health Grant - USD ($) $ in Millions	1 Months Ended	3 Months Ended		50 Months Ended
	Feb. 28, 2015	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Research and Development Arrangement, Contract to Perform for Others, Proposed Period	5 years
Total grant funding	$ 5.0	$ 0.1	$ 0.1
Cumulative amount awarded				$ 1.3