Net Loss Per Share - Schedule of Computation of Loss Per Share (Details) (Parenthetical) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Pre-funded warrants	3,316,666	3,316,666	3,316,666	3,316,666