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Development and License Agreements - Additional Information (Detail) € in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 31, 2019 EUR (€) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2018 USD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2018 USD ($)
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |
Payments made relating to the manufacturing of the products |  | $ 9,800,000 | $ 5,600,000 | $ 23,300,000 |  | $ 15,700,000 |  |
BARDA Agreement |  |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |
Committed fund receivable |  | 103,200,000 |  | 103,200,000 |  |  |  |
Committed fund receivable |  | 201,200,000 |  | $ 201,200,000 |  |  |  |
Period of agreement |  |  |  | 5 years | 5 years |  |  |
Accounts receivable of billed and unbilled amounts |  | $ 4,100,000 |  | $ 4,100,000 |  |  |  | $ 2,300,000
Cerus Corporation | BARDA Agreement |  |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |
Co-investment by the company |  |  |  | 5,000,000.0 |  |  |  |
Additional co-investment by the company |  |  |  | $ 9,600,000 |  |  |  |
Manufacturing and Supply Agreement | Fresenius |  |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |
Payments made based on the successful achievement of production volumes | € |  |  |  |  | € 8.6 |  |  |
Manufacturing and development payments | € | € 5.5 |  |  |  |  |  | € 3.1 |
Manufacturing and Supply Agreement | Fresenius | Measurement Input, Discount Rate |  |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |
Manufacturing and development obligations, discount rate |  |  |  |  |  |  | 9.72 |

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