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Debt - Additional Information (Detail) - Cerus Term Loans
 3 Months Ended
Jun. 30, 2014
USD ($)
Tranche
Mar. 31, 2016
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 would 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 Term Loan C 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, Term Loan C will 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%