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Convertible Senior Notes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |
--- | --- | ---
Jan. 25, 2016 | Sep. 30, 2012
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount |  | $ 2.0
Convertible Debt [Member] | Subsequent Event [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 325.0 |
Debt Instrument, Convertible, Conversion Price | $ 6.81 |
Stock Price Conversion Premium Based Upon | $ 5.56 |
Payments For Capped Call Transactions | $ 38.0 |
Percentage of Conversion Premium | 22.50% |
Cap Price on Call Transactions | $ 9.73 |
Debt Conversion, Converted Instrument, Type | The initial conversion rate for the Notes is 146.8213 shares of Novavax’ common stock per $1,000 principal amount of the Notes |
Annual interest rate of notes (as a percent) | 3.75% |
Percentage of Conversion Premium with Call Transactions | 75.00% |

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