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Development and License Agreements - Additional Information (Detail) € in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 EUR (€) | Dec. 31, 2016 EUR (€) | Jun. 30, 2017 EUR (€) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 EUR (€)
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |  |
Payments made relating to the manufacturing of the products |  | $ 3,200,000 | $ 3,500,000 |  |  |  |  |  |
BARDA Agreement |  |  |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |  |
Committed fund receivable | $ 88,200,000 |  | 88,200,000 |  |  |  |  |  |
Committed fund receivable | 186,200,000 |  | $ 186,200,000 |  |  |  |  |  |
Period of agreement |  |  |  | 5 years | 5 years |  |  |  |
Accounts receivable of billed and unbilled amounts |  | 1,400,000 |  | $ 1,400,000 |  |  |  | $ 1,000,000 |
Other current assets |  |  |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |  |
Research and development assets |  | 200,000 |  | 200,000 |  |  |  | 900,000 |
Amounts due from Fresenius |  | 500,000 |  | 500,000 |  |  |  | 300,000 |
Other assets |  |  |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |  |
Research and development assets |  | 2,300,000 |  | 2,300,000 |  |  |  | 2,000,000 |
Manufacturing efficiency assets |  | 2,000,000 |  | 2,000,000 |  |  |  | 2,100,000 |
Fresenius |  |  |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |  |
Allocated amount for research and development activities |  | 4,800,000 |  | 4,800,000 |  |  |  |  |
Manufacturing efficiency activity cost |  | 2,400,000 |  | 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 |  | 2,800,000 |  | 2,800,000 |  |  |  | 3,000,000 |
Manufacturing and Supply Agreement | Fresenius |  |  |  |  |  |  |  |  |
Licenses Agreements [Line Items] |  |  |  |  |  |  |  |  |
Payments made based on the successful achievement of production volumes | € |  |  |  |  |  | € 8.6 |  |  |
Accrual for manufacturing and development of entity products |  | $ 5,400,000 |  | $ 5,400,000 |  |  | € 4.7 | $ 4,800,000 | € 4.5
Manufacturing and development obligations, discount rate |  |  |  | 9.72% | 9.72% |  |  |  |
Manufacturing and development payments |  |  |  | $ 3,400,000 | € 3.1 |  |  |  |

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