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Income Tax - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in valuation allowance |  |  |  |  |  |  |  |  | $ 8,500,000 | $ (800,000) | $ 2,000,000
Federal statutory income tax rate |  |  |  |  |  |  |  |  | 34.00% |  |
Undistributed earnings, federal statutory income taxes |  |  |  |  |  |  |  |  | (14,661,000) | (5,329,000) | (5,725,000)
Net loss | (5,860,000) | (20,501,000) | (6,724,000) | (10,252,000) | (1,716,000) | (3,460,000) | (1,907,000) | (8,834,000) | (43,337,000) | (15,917,000) | (16,982,000)
Research and development tax credit carryforwards | 32,100,000 |  |  |  | 30,800,000 |  |  |  | 32,100,000 | 30,800,000 |
Internal Revenue Service (IRS) |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 381,700,000 |  |  |  |  |  |  |  | 381,700,000 |  |
Research and development tax credit carryforwards | 21,600,000 |  |  |  |  |  |  |  | 21,600,000 |  |
Internal Revenue Service (IRS) | Minimum |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards, expiration year |  |  |  |  |  |  |  |  | 2018 |  |
Research and development tax credit carryforwards, expiration year |  |  |  |  |  |  |  |  | 2018 |  |
Internal Revenue Service (IRS) | Maximum |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards, expiration year |  |  |  |  |  |  |  |  | 2033 |  |
Research and development tax credit carryforwards, expiration year |  |  |  |  |  |  |  |  | 2033 |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 218,100,000 |  |  |  |  |  |  |  | 218,100,000 |  |
Research and development tax credit carryforwards | 15,900,000 |  |  |  |  |  |  |  | 15,900,000 |  |
State and Local Jurisdiction | Minimum |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards, expiration year |  |  |  |  |  |  |  |  | 2014 |  |
State and Local Jurisdiction | Maximum |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards, expiration year |  |  |  |  |  |  |  |  | 2033 |  |
Cerus Europe B.V. |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Undistributed earning of foreign subsidiary |  |  |  |  |  |  |  |  | 2,800,000 |  |
Undistributed earnings, federal statutory income taxes |  |  |  |  |  |  |  |  | $ 900,000 |  |

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