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Acquisition of Isconova AB (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Novavax AB [Member] | Sep. 30, 2013 Minimum [Member] | Sep. 30, 2013 Maximum [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Novavax shares issued for Isconova AB shares acquired | 15,600,000 |  |  |  |  |  |  |
Value of shares of Novavax Common Stock issued | $ 41,942 |  |  |  |  |  |  |
Cash paid to Isconova warrant holders | 22 |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted-average useful life |  |  |  |  |  |  | 7 years | 20 years
Goodwill | 25,298 |  |  |  |  |  |  |
Revenue |  | 4,802 | 5,765 | 12,167 | 17,510 | 400 |  |
Net loss |  | (15,300) | (7,217) | (37,929) | (20,472) | (1,500) |  |
Transaction costs |  |  |  | 1,300 |  |  |  |
Aggregate remaining rental payments due under operating lease commitments |  | $ 1,900 |  | $ 1,900 |  |  |  |

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