| Component: (Network and Table) | |
|---|---|
| Network | 133 - Disclosure - Equipment - Equipment (Detail) (http://www.athersys.com/taxonomy/role/DisclosureEquipmentEquipment) |
| Table | Property, Plant and Equipment [Table] |
| Reporting Entity [Axis] | 0001368148 (http://www.sec.gov/CIK) |
| Property, Plant and Equipment [Line Items] | Period [Axis] | ||||||
|---|---|---|---|---|---|---|---|
2016-12-31 | 2015-12-31 | ||||||
| Property, Plant and Equipment, Type [Axis] | Property, Plant and Equipment, Type [Axis] | ||||||
| Laboratory Equipment [Member] | Office Equipment and Leasehold Improvements [Member] | Process Development Equipment Not Yet in Service [Member] | Property, Plant and Equipment, Type [Domain] | Laboratory Equipment [Member] | Office Equipment and Leasehold Improvements [Member] | Property, Plant and Equipment, Type [Domain] | |
Equipment, Gross | |||||||
Accumulated depreciation | ( | ( | |||||
Equipment, net | 2,605,000 | 1,135,000 | |||||