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Series C Convertible Preferred Stock (Details)
12 Months Ended
Mar. 01, 2016
USD ($)
director
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Class of Stock [Line Items]      
Dividend accrual, percentage 1.25%    
Dividends, preferred stock   $ 0 $ 0
Liquidation preference (in dollars per share) | $ / shares $ 1,000    
Optional conversion price for holders (in dollars per share) | $ / shares $ 5.00    
Percentage of number of shares of common stock outstanding 19.99%    
Temporary equity, conversion, common stock equivalent (in shares) | shares   87,051,524 87,100,000
Stock price trigger (in dollars per share) | $ / shares $ 10.00    
Number of directors | director 3    
Percentage of liquidation preference 100.00%    
Minimum      
Class of Stock [Line Items]      
Dividend accrual, percentage 1.25%    
Maximum      
Class of Stock [Line Items]      
Dividend accrual, percentage 5.00%    
Private Placement      
Class of Stock [Line Items]      
Discount on shares $ 8,700,000    
Series C Preferred Stock      
Class of Stock [Line Items]      
Shares issued (in shares) | shares 435,000    
Stock issued during period $ 435,000,000    
Dividends accrued   $ 65,800,000