Represents the term of a consulting agreement.

No definition available.

Name:	bcda_ConsultingAgreementTerm
Namespace Prefix:	bcda_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the length of time of each of the automatic renewal periods for the term of a consulting agreement.

+ References

No definition available.

+ Details

Name:	bcda_ConsultingAgreementTermLengthOfAutomaticRenewalPeriods
Namespace Prefix:	bcda_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of the entity that is owned by a specified related party.

+ References

No definition available.

+ Details

Name:	bcda_RelatedPartyOwnershipPercentage
Namespace Prefix:	bcda_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Grant-date fair value of non-vested options outstanding.

+ References

No definition available.

+ Details

Name:	bcda_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedGrantDateFairValue
Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bcda_OPKOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=bcda_ConsultingServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bcda_ChairmanAndChiefExecutiveOfficerOfOPKOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 19 - Related Party Transactions (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Aug. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		842,653
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 2.96	$ 1.78
Share-based Compensation		$ 2,707,000	$ 942,000	$ 283,000
OPKO [Member]
Related Party, Ownership Percentage	5.00%
OPKO [Member] \| Consulting Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	418,977
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 1.80
Share-based Compensation		480,000	$ 466,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Grant Date Fair Value		$ 5,300,000
Consulting Agreement, Term	4 years
Consulting Agreement, Term, Length of Automatic Renewal Periods	1 year
Chairman and Chief Executive Officer of OPKO [Member]
Related Party, Ownership Percentage	5.00%