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Debt - Additional Information (Detail) - Cerus Term Loans |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 USD ($) Tranche | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
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. |
Commitment and modification fee | $ 200,000 |  |
Lender legal fees | $ 100,000 |  |
Other non-current liabilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Accrued interest expense |  | $ 500,000 | $ 100,000
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% |

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