Stock-Based Compensation - Schedule of Restricted Common Stock Activity (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of shares Non-vested, Beginning Balance | shares	3,850,000
Number of shares, Granted | shares	2,760,000
Number of shares, Vested | shares	(2,705,000)
Number of shares, Forfeited | shares	(550,000)
Number of shares Non-vested, Ending Balance | shares	3,355,000
Weighted average grant date fair value Non-vested, Beginning Balance | $ / shares	$ 1.42
Weighted average grant date fair value Fair Value, Granted | $ / shares	1.33
Weighted average grant date fair value, Vested | $ / shares	1.41
Weighted average grant date fair value, Forfeited | $ / shares	1.06
Weighted average grant date fair value Non-vested, Ending Balance | $ / shares	$ 1.43