Stock-Based Compensation - Schedule of Non-Vested Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Options
Beginning balance (in shares)	224,355,000	0
Option granted (in shares)	340,558,000	225,745,000
Vested (in shares)	(55,919,000)
Canceled/forfeited (in shares)	(28,908,000)	(1,390,000)
Ending balance (in shares)	480,086,000	224,355,000
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 7.02	$ 0.00
Option granted (in dollars per share)	7.30	7.02
Vested (in dollars per share)	7.02
Canceled/forfeited (in dollars per share)	7.20	7.04
Ending balance (in dollars per share)	$ 7.21	$ 7.02