Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Nov. 08, 2018 USD ($) $ / shares shares	Dec. 31, 2018 vote / shares $ / shares shares	Dec. 31, 2017 $ / shares shares
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		750,000,000	750,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)		10,000,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01
Private placement agreement number of shares (in shares)	26,500,000
Private placement agreement price per share (in dollars per share) | $ / shares	$ 3.49
Private placement agreement value of shares | $	$ 92.5
Votes per common share | vote / shares		1
Designate shares of preferred stock (in shares)		10,000,000
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		4,000,000
Preferred stock, shares issued (in shares)		0	0
Preferred stock, shares outstanding (in shares)		0	0
Series C Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		500,000
Preferred stock, shares issued (in shares)		0	0
Preferred stock, shares outstanding (in shares)		0	0
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		2,000,000
Preferred stock, shares issued (in shares)		0	0
Preferred stock, shares outstanding (in shares)		0	0
Chief Executive Officer
Class of Stock [Line Items]
Private placement agreement value of shares | $	70.0
Chief Technical Officer
Class of Stock [Line Items]
Private placement agreement value of shares | $	$ 2.0