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CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY (Parenthetical)
Jun. 30, 2018
Convertible Notes | 1.625% Convertible Notes  
Debt Instrument [Line Items]  
Percentage of contractual interest rate 1.625%
Cash Convertible Senior Notes Due 2020, Warrants  
Debt Instrument [Line Items]  
Stated percentage of warrants 1.125%