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Income Taxes - Significant Components of Company's Deferred Taxes (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 29,442 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 25,696 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development credit carryforwards | 1,715 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch | 1,525 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Capitalized costs | 3,503 us-gaap_DeferredTaxAssetsTaxDeferredExpense | 3,067 us-gaap_DeferredTaxAssetsTaxDeferredExpense
Capitalized research and development costs | 9,938 ceru_DeferredTaxAssetsCapitalizedResearchAndDevelopmentCost | 6,992 ceru_DeferredTaxAssetsCapitalizedResearchAndDevelopmentCost
Other | 422 us-gaap_DeferredTaxAssetsOther | 220 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 45,020 us-gaap_DeferredTaxAssetsGross | 37,500 us-gaap_DeferredTaxAssetsGross
Valuation allowance | (45,020)us-gaap_DeferredTaxAssetsValuationAllowance | (37,500)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets | $ 0 us-gaap_DeferredTaxAssetsNet | $ 0 us-gaap_DeferredTaxAssetsNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss 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 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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