| 
           Property and Equipment (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        
           Dec. 31, 2014 
         | 
        
           Dec. 31, 2013 
         | 
      
|---|---|---|
| Property, Plant and Equipment [Abstract] | ||
| Lab equipment | $ 1,146cocp_LabEquipment | $ 1,113cocp_LabEquipment | 
| Computer and office equipment | 87cocp_ComputerAndOfficeEquipment | 92cocp_ComputerAndOfficeEquipment | 
| Total equipment | 1,233us-gaap_PropertyPlantAndEquipmentGross | 1,205us-gaap_PropertyPlantAndEquipmentGross | 
| Less accumulated depreciation | (949)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (736)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | 
| Property and equipment, net | $ 284us-gaap_PropertyPlantAndEquipmentNet | $ 469us-gaap_PropertyPlantAndEquipmentNet | 
| X | ||||||||||
| 
             
- Definition 
          custom:ComputerAndOfficeEquipment No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          custom:LabEquipment No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  |