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Defined Contribution 401(k) Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	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

X

- References

No definition available.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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X

- 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

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