License Agreements and Grants - National Institute of Health Grant (Details) - National Institute of Health Grant - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		56 Months Ended
	Feb. 28, 2015	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Grant period	5 years
Total grant funding	$ 5,000	$ 42	$ 69	$ 200	$ 200
Cumulative amount awarded						$ 1,300