XML 57 R45.htm IDEA: XBRL DOCUMENT
v3.22.2

Stockholders' Equity - Additional Information (Detail) - Cantor Fitzgerald & Co. and Stifel, Nicolaus & Company, Incorporated - Amendment No. 3 - Sales Agreements - USD ($) |  | 6 Months Ended
--- | --- | ---
Dec. 11, 2020 | Jun. 30, 2022
Stockholders Equity Note [Line Items] |  |
Maximum common stock offering price | $ 100,000,000.0 |
Percentage of proceeds payable as compensation to underwriter | 2.00% |
Issuance of common stock from public offerings, net of offering costs (in shares) |  | 0
Common stock available to be sold |  | $ 96,800,000

X
- Definition Common stock shares available for sale value. + References No definition available. + Details
Name: | cers_CommonStockSharesAvailableForSaleValue
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum amount available under ATM offering. + References No definition available. + Details
Name: | cers_MaximumAmountAvailableUnderOffering
Namespace Prefix: | cers_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of proceeds payable as compensation to underwriter. + References No definition available. + Details
Name: | cers_PercentageOfProceedsPayableAsCompensationToUnderwriter
Namespace Prefix: | cers_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stockholders equity note. + References No definition available. + Details
Name: | cers_StockholdersEquityNoteLineItems
Namespace Prefix: | cers_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of new stock issued during the period. + 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: 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=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CounterpartyNameAxis=cers_CantorFitzgeraldCoAndStifelNicolausCompanyIncorporatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=cers_SalesAmendmentThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=cers_SalesAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |