XML 60 R48.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Stockholders' Equity - Additional Information (Detail) - USD ($) shares in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | May 05, 2016
Stockholders Equity Note [Line Items] |  |  |
Proceeds from common stock sold | $ 22,146,000 | $ 75,327,000 |
Cantor | Sales Agreement |  |  |
Stockholders Equity Note [Line Items] |  |  |
Maximum common stock offering price | 132,200,000 |  |
Common stock registered for sale | $ 62,300,000 |  | $ 70,000,000
Percentage of proceeds payable as compensation to underwriter | 2.00% |  |
Common stock, number of shares issued | 3.5 |  |
Proceeds from common stock sold | $ 22,000,000 |  |

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: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stockholders Equity Note [Line Items] + References No definition available. + Details
Name: | cers_StockholdersEquityNoteLineItems
Namespace Prefix: | cers_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CounterpartyNameAxis=cers_CantorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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