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Debt - Additional Information (Detail) - Cerus Term Loans
 9 Months Ended
Jun. 30, 2014
USD ($)
Tranche
Sep. 30, 2015
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 bears an interest rate of 6.95%. Term Loan B bears an interest rate of 7.01%. Term Loan C will bear an interest rate calculated at the greater of 6.95% or 6.72% plus the three month U.S. LIBOR rate in effect three business days prior to the funding date.
Maturity period   Jun. 01, 2019
Principal and interest payments 36 months  
Final payment term percent 7.00%  
Terms of required periodic payments of interest and principal   The Company is required to make interest only payments through June 2016 followed by thirty-six months of equal principal and interest payments thereafter; however, if the Revenue Event is achieved no later than May 31, 2016, then the interest-only period may be extended through December 31, 2016, and the amortization period will be reduced to thirty months. The Company is 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.
Securities Pledged as Collateral    
Line of Credit Facility [Line Items]    
Percentage of investments made in subsidiary 35.00%  
First Tranche (Term Loan A)    
Line of Credit Facility [Line Items]    
Loan and security agreement $ 10,000,000  
Interest rate 6.95%  
Second Tranche (Term Loan B)    
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%
Third Tranche (Term Loan C)    
Line of Credit Facility [Line Items]    
Loan and security agreement $ 10,000,000  
Borrowing conditions   As amended, the third tranche of $10.0 million ("Term Loan C") would be available, subject to the Company achieving consolidated trailing six months' revenue at a specified threshold (the "Revenue Event")
Interest rate, minimum   6.95%
Interest rate plus the three month U.S. LIBOR   6.72%