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Consolidated Statements of Stockholders' Equity (Parenthetical)
Dec. 31, 2018
1.625% Convertible Notes  
Debt Instrument [Line Items]  
Percentage of contractual interest rate 1.625%
Convertible Debt | 1.625% Convertible Notes  
Debt Instrument [Line Items]  
Percentage of contractual interest rate 1.625%
1.125% Warrants  
Debt Instrument [Line Items]  
Stated interest rate 1.125%