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Debt - Additional Information (Detail) - Cerus Term Loans |  | 9 Months Ended
--- | --- | ---
Jun. 30, 2014 USD ($) Tranche | Sep. 30, 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%.
Principal and interest payments | 36 months | 29 months
Final payment term percent | 7.00% |
Terms of required periodic payments of interest and principal |  | 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 is required to make interest only payments from August 2016 through January 2017, followed by twenty-nine months of equal principal and interest payments thereafter. The Company determined that the amendment to the Term Loan Agreement resulted in a modification. As a result, the accounting treatment for the Term Loan will continue under the interest method, with a new effective interest rate based on revised cash flows calculated on a prospective basis upon the execution of the amendment to the Term Loan Agreement. 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.
First Tranche (Term Loan A) |  |
Line of Credit Facility [Line Items] |  |
Loan and security agreement | $ 10,000,000 |
Interest rate | 6.95% |
Maturity period |  | Jun. 01, 2019
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%
Maturity period |  | Jun. 01, 2019
Third Tranche (Term Loan C) |  |
Line of Credit Facility [Line Items] |  |
Loan and security agreement | $ 10,000,000 |
Borrowing conditions |  | As amended, the availability of Term Loan C was subject to the Company achieving consolidated trailing six months’ revenue at a specified threshold (the “Revenue Event”) no later than June 30, 2016.
Securities Pledged as Collateral |  |
Line of Credit Facility [Line Items] |  |
Percentage of investments made in subsidiary | 35.00% |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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