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Income Tax - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in valuation allowance |  |  |  |  |  |  |  |  | $ (800,000) | $ 2,000,000 | $ 7,200,000
Federal statutory income tax rate |  |  |  |  |  |  |  |  | 34.00% |  |
Undistributed earnings, federal statutory income taxes |  |  |  |  |  |  |  |  | (5,329,000) | (5,725,000) | (5,718,000)
Net loss | (1,716,000) | (3,460,000) | (1,907,000) | (8,834,000) | (7,735,000) | 2,260,000 | (6,409,000) | (5,098,000) | (15,917,000) | (16,982,000) | (16,911,000)
Research and development tax credit carryforwards | 30,800,000 |  |  |  | 31,400,000 |  |  |  | 30,800,000 | 31,400,000 |
Internal Revenue Service (IRS) |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 360,200,000 |  |  |  |  |  |  |  | 360,200,000 |  |
Research and development tax credit carryforwards | 20,500,000 |  |  |  |  |  |  |  | 20,500,000 |  |
Internal Revenue Service (IRS) | Minimum |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards, expiration year |  |  |  |  |  |  |  |  | 2018 |  |
Internal Revenue Service (IRS) | Maximum |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards, expiration year |  |  |  |  |  |  |  |  | 2032 |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 293,200,000 |  |  |  |  |  |  |  | 293,200,000 |  |
Research and development tax credit carryforwards | 15,600,000 |  |  |  |  |  |  |  | 15,600,000 |  |
State and Local Jurisdiction | Minimum |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards, expiration year |  |  |  |  |  |  |  |  | 2013 |  |
State and Local Jurisdiction | Maximum |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards, expiration year |  |  |  |  |  |  |  |  | 2032 |  |
Cerus Europe B.V. |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Undistributed earning of foreign subsidiary |  |  |  |  |  |  |  |  | 2,100,000 |  |
Undistributed earnings, federal statutory income taxes |  |  |  |  |  |  |  |  | $ 700,000 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 + Details
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