Due to Related Parties, Reduction From Prior Period

No definition available.

Name:	fcsc_DuetoRelatedPartiesReductionFromPriorPeriod
Namespace Prefix:	fcsc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the number of directors of reporting entity.

+ References

No definition available.

+ Details

Name:	fcsc_NumberOfDirectors
Namespace Prefix:	fcsc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Collaboration Agreements

+ References

No definition available.

+ Details

Name:	fcsc_NumberofCollaborationAgreements
Namespace Prefix:	fcsc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Shareholder Ownership Percentage

+ References

No definition available.

+ Details

Name:	fcsc_ShareholderOwnershipPercentage
Namespace Prefix:	fcsc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Shareholder Ownership Percentage of Related Party in Affiliate

+ References

No definition available.

+ Details

Name:	fcsc_ShareholderOwnershipPercentageofRelatedPartyinAffiliate
Namespace Prefix:	fcsc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DueToRelatedPartiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_PreferredStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

+ Details

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

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

+ Details

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

- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373

+ Details

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

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=fcsc_WarrantsIssuedWithSeptember2016ConvertibleNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=fcsc_A2012ExclusiveChannelCollaborationAgreementDisputeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions (Details)		3 Months Ended				9 Months Ended
Related Party Transactions (Details)	Jan. 06, 2018 shares	Sep. 30, 2018 USD ($) agreement shares	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) director agreement shares	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2016 USD ($) shares
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of exclusive channel collaboration agreements (agreement) \| agreement		2				2
Royalty and milestone payments incurred						$ 0
Related party payable		$ 63,000				63,000		$ 2,303,000
Research and development expense		1,541,000		$ 1,657,000		4,601,000	$ 4,800,000
Common stock issued (shares) \| shares	409,091
Warrants Issued With September 2016 Convertible Notes
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Warrants issued to purchase common stock (in shares) \| shares									1,205,840
Convertible Debt
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Convertible debt principal									$ 18,087,500
Affiliated Entity
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Expenses for work performed		60,000		1,000,000		400,000	4,200,000
Related party payable		100,000				100,000		2,300,000
Research and development expense		$ 63,000		981,000		$ (134,000)	4,168,000
Shareholder ownership percentage of related party in affiliate, more than		50.00%				50.00%
Shareholder ownership percentage		18.00%				18.00%
Affiliated Entity \| 2017 Private Placement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Warrants issued to purchase common stock (in shares) \| shares		545,456				545,456			259,176
Preferred stock, shares issued (shares) \| shares									3,016
Common stock issued (shares) \| shares						545,456
Affiliated Entity \| Warrants Issued With September 2016 Convertible Notes
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Warrants issued to purchase common stock (in shares) \| shares									450,835
Affiliated Entity \| Convertible Debt
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Convertible debt principal									$ 6,762,500
Director
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of directors (director) \| director						2
Direct Expenses for Work Performed \| Affiliated Entity
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Expenses for work performed		$ 10,000		300,000		$ 100,000	900,000
Pass-through Costs \| Affiliated Entity
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Expenses for work performed		50,000		$ 700,000		300,000	$ 3,300,000
Reduction to Pass-Through Costs \| Affiliated Entity
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Expenses for work performed						500,000
2012 ECC Dispute \| Affiliated Entity
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Related party payable		$ 200,000				$ 200,000		$ 700,000
Research and development expense			$ 1,400,000		$ 1,100,000
Due to related parties, reduction from prior period			$ 500,000