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Subsequent Events - Convertible Note Exchange (Details)
$ / shares in Units, $ in Millions
Feb. 24, 2020
USD ($)
day
Apr. 03, 2019
day
Mar. 04, 2020
$ / shares
Dec. 31, 2019
Mar. 31, 2019
Aug. 09, 2018
Nov. 02, 2015
Subsequent Event [Line Items]              
Maximum equity owned by Investor       9.50%      
Convertible Senior Notes Due 2020              
Subsequent Event [Line Items]              
Debt instrument, stated interest rate       3.25%   3.25%  
Convertible notes | Convertible Senior Notes Due 2020              
Subsequent Event [Line Items]              
Debt instrument, stated interest rate           3.25% 3.25%
Convertible notes | 5% Note              
Subsequent Event [Line Items]              
Debt instrument, stated interest rate   5.00%     5.00%    
Limit on conversion   30.00%          
Convertible debt, conversion ratio   0.15129          
Convertible debt redemption, consecutive trading days threshold   5          
Convertible notes | 5% Note | Subsequent Event              
Subsequent Event [Line Items]              
Limit on conversion     30.00%        
Convertible debt, conversion ratio 0.4445            
Conversion price (USD per share) | $ / shares     $ 2.25        
Threshold trading days 20            
Convertible debt redemption, consecutive trading days threshold 30            
Convertible debt redemption, percentage of stock price trigger 110.00%            
Maximum equity owned by Investor     9.50%        
Holders | Convertible notes | Convertible Senior Notes Due 2020 | Subsequent Event              
Subsequent Event [Line Items]              
Debt conversion, original debt amount | $ $ 11.0