Nature of Business and Basis of Presentation (Details) $ / shares in Units, $ in Millions	Oct. 10, 2018 $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Oct. 09, 2018 $ / shares shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reverse stock split ratio	0.0833
Shares outstanding (in shares) | shares	90,811,562		1,089,738,735
Shares authorized (shares) | shares	300,000,000	300,000,000	3,500,000,000
Par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.00001
Minimum | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities		$ 120
ROU asset		120
Maximum | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities		135
ROU asset		$ 135