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Defined Contribution 401(k) Plan - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract] |  |
Defined contribution plan, employer discretionary contributions amount | $ 0 | $ 0
Defined Contribution Plan, Plan Name [Extensible List] | bdsx:FourZeroOneKPlanMember | bdsx:FourZeroOneKPlanMember

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Indicates name of defined contribution plan designed to provide retirement benefits. Includes, but is not limited to, legal name of plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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