Stock-Based Compensation - Schedule of Restricted Common Stock Activity (Details)	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Share-based Payment Arrangement [Abstract]
Number of shares Non-vested, Beginning Balance | shares	3,355,000
Number of shares, Vested | shares	(704,999)
Number of shares Non-vested, Ending Balance | shares	2,650,001
Weighted average grant date fair value Non-vested, Beginning Balance | $ / shares	$ 1.46
Weighted average grant date fair value, Vested | $ / shares	1.63
Weighted average grant date fair value Non-vested, Ending Balance | $ / shares	$ 1.41