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Subsequent Events - Additional Information (Detail) - Subsequent Event - USD ($) | Jul. 31, 2017 | Aug. 04, 2017
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Cantor | Sales Agreement | Amendment No. 3 |  |
Subsequent Event [Line Items] |  |
Common stock registered for sale |  | $ 70,000,000
Cerus Restated Term Loan Agreement |  |
Subsequent Event [Line Items] |  |
Maximum borrowing limit | $ 40,000,000 |
Maturity period | Jul. 01, 2022 |
Final payment term percent | 8.00% |
Terms of required periodic payments of interest and principal | The Restated Term Loan Agreement provides for secured growth capital loans of up to $40.0 million (the “Term Loans”). All of the Company’s current and future assets, excluding its intellectual property and 35% of the Company’s investment in Cerus Europe B.V., are secured for its borrowings under the Restated Term Loan Agreement. On July 31, 2017, the Company received $30.0 million from the first tranche under the Restated Term Loan Agreement, and settled its prior Term Loan Agreement. The second tranche of $10.0 million will be available subject to the Company achieving consolidated trailing six months’ revenue at a specified threshold no later than January 31, 2019. The Term Loans shall be interest-only through February 1, 2019 followed by 42 months of equal principal and interest. |
Borrowing conditions | However, if the Company draws the Term Loan Two, then the interest-only period will be extended through August 1, 2019, and the amortization period will be reduced to 36 months. |
Interest rate, description | The interest rate of the term loans is 6.72% plus the index rate, which is floating and will be reset monthly as the greater of (i) 8.01% and (ii) the sum of the three-month U.S. LIBOR rate plus (b) 6.72%. The Company will also be required to make a final payment fee of 8.00% of the amounts of the Term Loans drawn payable on the earlier of (i) the prepayment of the Term Loans or (ii) the Maturity Date. |
Cerus Restated Term Loan Agreement | Three-month U.S. LIBOR |  |
Subsequent Event [Line Items] |  |
Debt, applicable margin | 6.72% |
Cerus Restated Term Loan Agreement | Minimum |  |
Subsequent Event [Line Items] |  |
Debt instrument floating interest rate percentage | 8.01% |
Cerus Restated Term Loan Agreement | First Tranche (Term Loan A) |  |
Subsequent Event [Line Items] |  |
Loan and security agreement | $ 30,000,000 |
Interest-only payment date | Feb. 01, 2019 |
Principal and interest payments | 42 months |
Cerus Restated Term Loan Agreement | Second Tranche (Term Loan B) |  |
Subsequent Event [Line Items] |  |
Loan and security agreement available upon revenue achievement | $ 10,000,000 |
Interest-only period extension date | Aug. 01, 2019 |
Amortization Period | 36 months |
Cerus Restated Term Loan Agreement | Securities Pledged as Collateral |  |
Subsequent Event [Line Items] |  |
Percentage of investments made in subsidiary | 35.00% |

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