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		44 Months Ended
	Feb. 28, 2015	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018
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	$ 5,000	$ 69	$ 180	$ 167	$ 183
Cumulative amount awarded						$ 1,100