| Component: (Network and Table) | |
|---|---|
| Network | 100440 - Disclosure - Property and Equipment - Schedule of Property and Equipment (Details) (http://www.blackline.com/20161231/taxonomy/role/DisclosurePropertyAndEquipmentScheduleOfPropertyAndEquipmentDetails) |
| Table | Schedule Of Property Plant And Equipment [Table] |
| Reporting Entity [Axis] | 0001666134 (http://www.sec.gov/CIK) |
| Property Plant And Equipment [Line Items] | Period [Axis] | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
2016-12-31 | 2015-12-31 | |||||||||||
| Property, Plant and Equipment, Type | Property, Plant and Equipment, Type | |||||||||||
| Computers and equipment | Purchased software | Furniture and fixtures | Leasehold improvements | Construction in progress | Property, Plant and Equipment, Type | Computers and equipment | Purchased software | Furniture and fixtures | Leasehold improvements | Construction in progress | Property, Plant and Equipment, Type | |
Property and equipment, gross | ||||||||||||
Less: accumulated depreciation | ( | ( | ||||||||||
Property and equipment, net | 11,318,000 | 12,419,000 | ||||||||||