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v3.20.4

Subsequent Events - Additional Information (Details) - Subsequent Event | Jan. 01, 2021 Employee
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Software |
Subsequent Event [Line Items] |
Transfer of employees | 105
Manufacturing |
Subsequent Event [Line Items] |
Transfer of employees | 22

X
- Definition Transfer of employees. + References No definition available. + Details
Name: | sonm_TransferOfEmployees
Namespace Prefix: | sonm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=sonm_ManufacturingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |