Stock-Based Compensation - Schedule of Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Options
Option granted (in shares)	340,558,000	225,745,000
Weighted Average Exercise Price
Option granted (in dollars per share)	$ 7.30	$ 7.02
2017 Stock Incentive Plan
Options
Beginning balance (in shares)	224,355,000	0
Option granted (in shares)	340,558,000	225,745,000
Options exercised (in shares)	(1,641,000)	0
Options canceled/forfeited (in shares)	(29,689,000)	(1,390,000)
Ending balance (in shares)	533,583,000	224,355,000
Options exercisable (in shares)	53,497,000	0
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 14.01	$ 0.00
Option granted (in dollars per share)	15.39	14.01
Options exercised (in dollars per share)	11.27	0.00
Options canceled/forfeited (in dollars per share)	14.77	14.00
Ending balance (in dollars per share)	14.86	14.01
Options exercisable (in dollars per share)	$ 14.09	$ 0.00