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Debt - Additional Information (Detail)
 6 Months Ended
Jul. 31, 2017
USD ($)
Tranche
Apr. 27, 2017
Jul. 28, 2016
Jun. 30, 2014
USD ($)
Tranche
Jun. 30, 2017
Cerus Term Loans          
Line of Credit Facility [Line Items]          
Maximum borrowing limit       $ 30,000,000  
Term of agreement       5 years  
Number of loan tranches | Tranche       3  
Interest rate, description         Term Loan A bore an interest rate of 6.95%. Term Loan B bore an interest rate of 7.01%.
Principal and interest payments   18 months 29 months 36 months  
Final payment term percent       7.00%  
Terms of required periodic payments of interest and principal         On September 29, 2015, the Term Loan Agreement was amended to extend (i) the period in which the third tranche could have been drawn and (ii) the interest-only period for all advances under the Term Loan Agreement. The Company was required to make interest only payments through June 2016, followed by thirty-six months of equal principal and interest payments thereafter. On July 28, 2016, the Term Loan Agreement was amended to include an additional interest-only period for all advances under the Term Loan Agreement. As amended, the Company was required to make interest only payments from August 2016 through January 2017, followed by twenty-nine months of equal principal and interest payments thereafter. On April 27, 2017, the Term Loan Agreement was amended to include an additional interest-only period for all advances under the Term Loan Agreement. As amended, the Company was required to make interest only payments from May 2017 through December 2017, followed by eighteen months of equal principal and interest payments thereafter. The Company determined that these amendments to the Term Loan Agreement resulted in debt modifications. As a result, the accounting treatment for the Term Loan continues under the interest method, with a new effective interest rate based on revised cash flows calculated on a prospective basis upon the execution of each of these amendments to the Term Loan Agreement. The Company was also required to make a final payment equal to 7% of the principal amounts of the Term Loans drawn payable on the earlier to occur of maturity or prepayment.
Cerus Restated Term Loan Agreement | Subsequent Event          
Line of Credit Facility [Line Items]          
Maximum borrowing limit $ 40,000,000        
Term of agreement 5 years        
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.        
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.        
Number of tranches | Tranche 2        
First Tranche (Term Loan A) | Cerus Term Loans          
Line of Credit Facility [Line Items]          
Loan and security agreement       $ 10,000,000  
Interest rate       6.95%  
Maturity period         Jun. 01, 2019
First Tranche (Term Loan A) | Cerus Restated Term Loan Agreement | Subsequent Event          
Line of Credit Facility [Line Items]          
Loan and security agreement $ 30,000,000        
Principal and interest payments 42 months        
Second Tranche (Term Loan B) | Cerus Term Loans          
Line of Credit Facility [Line Items]          
Loan and security agreement       $ 10,000,000  
Borrowing conditions         The second tranche of $10.0 million (“Term Loan B”) was drawn on June 15, 2015.
Interest rate         7.01%
Maturity period         Jun. 01, 2019
Securities Pledged as Collateral | Cerus Term Loans          
Line of Credit Facility [Line Items]          
Percentage of investments made in subsidiary       35.00%  
Securities Pledged as Collateral | Cerus Restated Term Loan Agreement | Subsequent Event          
Line of Credit Facility [Line Items]          
Percentage of investments made in subsidiary 35.00%