Sale Of Stock, Number Of Shares Available For Underwriter Option

No definition available.

Name:	sibn_SaleOfStockNumberOfSharesAvailableForUnderwriterOption
Namespace Prefix:	sibn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
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
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=sibn_SecondFollowOnPublicOfferingMember
Namespace Prefix:
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- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=sibn_SecondaryOfferingMember
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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		9 Months Ended
	Oct. 19, 2020	Oct. 31, 2020	Feb. 29, 2020	Sep. 30, 2020	Sep. 30, 2019
Subsequent Event [Line Items]
Offering costs				$ 0	$ 167
Underwriters option
Subsequent Event [Line Items]
Net proceeds from sale of stock			$ 13,000
Number of shares issued (in shares)			645,000
Public offering price (in dollars per share)			$ 21.50
Subsequent event \| Second follow-on public offering
Subsequent Event [Line Items]
Net proceeds from sale of stock		$ 71,900
Number of shares issued (in shares)		3,000,000
Public offering price (in dollars per share)		$ 22.00
Offering costs		$ 400
Subsequent event \| Underwriters option
Subsequent Event [Line Items]
Number of shares available for underwriter option		478,507
Subsequent event \| Secondary offering by selling shareholders
Subsequent Event [Line Items]
Number of shares issued (in shares)	190,053
Public offering price (in dollars per share)	$ 22.00