Strategic Research Collaboration (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Collaboration Agreement [Abstract]
Funding in strategic research collaboration	$ 3.5
Percentage of funding due upon execution of the agreement	40.00%
Initial funding due upon the execution of the agreement	$ 1.4
Accrued funding in strategic research collaboration	$ 1.4