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Development and License Agreements - Additional Information (Detail) € in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€)
Licenses Agreements [Line Items] |  |  |  |  |  |  |
Payments made relating to the manufacturing of the products | $ 18,100,000 |  | $ 16,100,000 |  | $ 14,900,000 |  |
BARDA Agreement |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |
Committed fund receivable | 88,200,000 |  |  |  |  |  |
Committed fund receivable | $ 186,200,000 |  |  |  |  |  |
Period of agreement | 5 years | 5 years |  |  |  |  |
Accounts receivable of billed and unbilled amounts | $ 1,400,000 |  | 1,000,000 |  |  |  |
Other current assets |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |
Amounts due from Fresenius | 200,000 |  | 300,000 |  |  |  |
Fresenius |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |
Allocated amount for research and development activities | 4,800,000 |  |  |  |  |  |
Manufacturing efficiency activity cost | 2,400,000 |  |  |  |  |  |
Cerus Corporation | BARDA Agreement |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |
Co-investment by the company | 5,000,000 |  |  |  |  |  |
Additional co-investment by the company | 9,600,000 |  |  |  |  |  |
Manufacturing and Supply Agreement |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |
Accrual for manufacturing of entity products | 4,700,000 |  | $ 3,000,000 |  |  |  |
Manufacturing and Supply Agreement | Fresenius |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |
Payments made based on the successful achievement of production volumes | € |  | € 8.6 |  |  |  |  |
Manufacturing and development obligations, discount rate |  |  | 9.72% | 9.72% |  |  |
Manufacturing and development payments | € |  |  |  | € 3.1 |  |  |
Remaining amount payable for manufacturing and development | € |  | € 5.5 |  |  |  |  |
Accrual for manufacturing and development of entity products | $ 5,800,000 |  | $ 4,800,000 |  |  | € 4.8 | € 4.5

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