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Debt - Additional Information (Detail) | Mar. 29, 2019 USD ($) Tranche | Jul. 31, 2017 USD ($) Tranche | Mar. 31, 2019 USD ($)
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Oxford Term Loan Agreement | 2017 Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Term loan, face amount |  | $ 40,000,000 |
Number of loan tranches | Tranche |  | 2 |
Repayments principal and interest aggregate amount | $ 31,200,000 |  |
Prepayment fees in aggregate amount | 600,000 |  |
Oxford Term Loan Agreement | 2017 Term Loans | Interest Expense |  |  |
Debt Instrument [Line Items] |  |  |
Extinguishment loss recorded | 2,100,000 |  |
Cerus Term Loans | 2017 Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Repay in full all of outstanding term loans |  | $ 1,400,000 |
Term Loan Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Term loan, face amount | $ 70,000,000 |  |
Number of loan tranches | Tranche | 3 |  |
Debt instrument maturity date | Mar. 01, 2024 |  |
Term Loan Credit Agreement | Two Thousand Nineteen Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument floating interest rate percentage | 1.80% |  |
Effective interest rate |  |  | 8.20%
Interest-only payments date | Apr. 01, 2022 |  |
Principal plus declining interest payments | 24 months |  |
Interest only payment period | 12 months |  |
Trailing net revenue target period | 12 months |  |
Revolving Loan Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Term loan, face amount | $ 5,000,000 |  | $ 0
Loan and security agreement available upon revenue achievement | $ 15,000,000 |  |
Debt instrument floating interest rate percentage | 1.80% |  |
Revolving Loan Credit Agreement | Two Thousand Nineteen Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date | Mar. 01, 2024 |  |
First Tranche (Term Loan A) | Oxford Term Loan Agreement | 2017 Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Term loan, face amount |  | 30,000,000 |
First Tranche (Term Loan A) | Cerus Term Loans | 2017 Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Repay in full all of outstanding term loans |  | 17,600,000 |
Second Tranche (Term Loan B) | Oxford Term Loan Agreement | 2017 Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Loan and security agreement available upon revenue achievement |  | $ 10,000,000 |
Expiration date to draw second tranche |  | May 14, 2018 |
Tranche 1 | Term Loan Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Term loan, face amount | $ 40,000,000 |  |
Tranche 2 | Term Loan Credit Agreement | Two Thousand Nineteen Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Loan and security agreement available upon revenue achievement | 15,000,000 |  |
Tranche 3 | Term Loan Credit Agreement | Two Thousand Nineteen Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Loan and security agreement available upon revenue achievement | $ 15,000,000 |  |

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