XML 46 R35.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Significant Accounting Policies and Concentrations of Risk - Net Loss Per Share (Details) - shares shares in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Significant Accounting Policies and Concentration of Risk [Line Items] |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 45,704 | 55,535
Outstanding stock options |  |
Significant Accounting Policies and Concentration of Risk [Line Items] |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 39,580 | 35,858
Unvested restricted stock unit awards |  |
Significant Accounting Policies and Concentration of Risk [Line Items] |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 6,124 | 4,654
Warrants to purchase common stock |  |
Significant Accounting Policies and Concentration of Risk [Line Items] |  |
Antidilutive securities excluded from computation of earnings per share, amount (in shares) | 0 | 15,023

X
- Definition Significant Accounting Policies and Concentrations of Risk + References No definition available. + Details
Name: | bcrx_SignificantAccountingPoliciesAndConcentrationsOfRiskLineItems
Namespace Prefix: | bcrx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |