License Agreements (Details) - USD ($) $ in Millions	1 Months Ended
	Oct. 31, 2017	Feb. 29, 2016
Settlement Agreement and Associated License Agreement, 2014, Shire LLC, New Drug Application
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
License agreement, up-front, non-refundable license fee paid, maximum		$ 1.0
License Agreement, 2017, Shire LLC, New Drug Application
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
License agreement, up-front, non-refundable license fee paid, maximum	$ 1.0