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Debt - Narrative (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 shares | Jun. 30, 2018 shares | Mar. 31, 2018 shares | Sep. 30, 2019 item
Convertible Notes |  |  |  |
Common stock issued in exchange of notes (in shares) | shares | 38 | 38 | 539 |
Convertible Senior Notes 0.375 Percent Due 2018 and Convertible Senior Notes 1.25 Percent Due 2020 |  |  |  |
Convertible Notes |  |  |  |
Number of days within 30 consecutive trading days in which the price of the entity's common stock must exceed the conversion price for the notes to be converted |  |  |  | 20 days
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible |  |  |  | 30 days
Percentage of the closing sales price of common stock that the conversion price must exceed in order for the notes to be convertible (as a percent) |  |  |  | 130.00%
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period |  |  |  | 5
Number of consecutive trading days before five consecutive business days during the note measurement period |  |  |  | 5
Conversion ratio, principal amount of note |  |  |  | 1,000
Percentage of the trading price to the product of the last reported sale price of the common stock and the conversion rate, maximum (as a percent) |  |  |  | 98.00%

X
- Definition Represents the percentage of the closing sales price of the common stock for at least 20 days within 30 consecutive trading days that the closing sales price of the common stock must exceed the conversion price in order for the debt instruments to be convertible. + References No definition available. + Details
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- Definition Represents the number of trading days within a period of 30 consecutive trading days the price of the entity's common stock must exceed the applicable conversion price in order for the debt instruments to be convertible. + References No definition available. + Details
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- Definition Represents the number of consecutive business days immediately after any five consecutive trading day period during the debt instrument measurement period. + References No definition available. + Details
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- Definition Represents the number of consecutive trading days during which the closing price of the entity's common stock must exceed the applicable conversion price for at least 20 days in order for the debt instruments to be convertible. + References No definition available. + Details
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- Definition Represents the maximum percentage of the trading price of each debt instrument to the product of the last reported sale price of common stock and the conversion rate of the debt instrument that the trading price must be less than in order for the debt instruments to be convertible. + References No definition available. + Details
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