XML 24 R47.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Stockholders Equity - Additional Information (Detail) (USD $) | 9 Months Ended |  |  |  |  |  | 3 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 2009 Unit Offering | Aug. 31, 2009 2009 Unit Offering | Sep. 30, 2014 2010 Unit Offering | Nov. 30, 2010 2010 Unit Offering | Sep. 30, 2014 Warrant 2009 Unit Offering | Nov. 30, 2010 Warrant 2010 Unit Offering | Sep. 30, 2014 Warrant 2010 Unit Offering | Sep. 30, 2014 Stockholder Rights Plan | Sep. 30, 2014 Sales Agreement Cantor | Dec. 31, 2013 Sales Agreement Cantor
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase an aggregate shares of common stock |  |  |  |  |  | 2,400,000 |  | 3,700,000 |  |  |  |  |  |
Warrant exercise price |  |  |  |  |  | $ 2.90 |  | $ 3.20 |  |  |  |  |  |
Warrants exercisable date |  |  |  |  |  |  |  |  |  | May 15, 2011 |  |  |  |
Exercisable period |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Warrants exercised |  |  |  |  |  |  |  |  | 2,400,000 |  | 157,894 |  |  |
Warrant liability | $ 3,931,000 |  | $ 20,390,000 | [1] | $ 0 |  | $ 3,300,000 |  |  |  |  |  |  |
Maximum common stock offering price |  |  |  |  |  |  |  |  |  |  |  |  | 70,000,000 |
Percentage of proceeds payable as compensation to underwriter |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% |
Common stock, number of shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 | 5,400,000
Proceeds from common stock sold | 6,849,000 | 50,981,000 |  |  |  |  |  |  |  |  |  |  | 7,100,000 | 23,500,000
Common stock available for sale |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,400,000 |
Minimum percentage of common stock acquired by stockholders |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |
Designated preferred stock for future issuance |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |
[1] | The financial information in this column was derived from audited financial statements included in the Company's 2013 Annual Report on Form 10-K.

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 Designated preferred stock for future issuance. + References No definition available. + Details
Name: | cers_DesignatedPreferredStockForFutureIssuance
Namespace Prefix: | cers_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Exercisable period. + References No definition available. + Details
Name: | cers_ExercisablePeriod
Namespace Prefix: | cers_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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 Minimum percentage of common stock acquired by stockholders allowing certain preferred stockholders to purchase common stock at a discount to the public market price. + References No definition available. + Details
Name: | cers_MinimumPercentageOfCommonStockAcquiredByStockholders
Namespace Prefix: | cers_
Data Type: | num:percentItemType
Balance Type: | na
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
- Details
Name: | cers_StockholdersEquityNoteLineItems
Namespace Prefix: | cers_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrants Exercisable Date + References No definition available. + Details
Name: | cers_WarrantsExercisableDate
Namespace Prefix: | cers_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrants exercised. + References No definition available. + Details
Name: | cers_WarrantsExercised
Namespace Prefix: | cers_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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=31042434&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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 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 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
Name: | us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant