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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Debt Instrument [Line Items]            
Stated percentage of warrants       1.625%    
1.125% Warrants            
Debt Instrument [Line Items]            
Stated percentage of warrants 1.125% 1.125% 1.125% 1.125% 1.125%  
Convertible Notes | 1.625% Notes            
Debt Instrument [Line Items]            
Percentage of contractual interest rate       1.625%   1.625%