XML 62 R52.htm IDEA: XBRL DOCUMENT
v3.22.2

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 11, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jul. 31, 2020
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Contingent severance obligation accrual |  |  |  |  |  | $ 2,000 |
Transaction Bonus Plan ("Plan") |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of consideration payable | 10.00% |  |  |  |  |  |
Term of plan | 3 years |  |  |  |  |  |
Former Chief Executive Officer |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Salary to be paid |  |  |  | $ 400 |  |  |
Former Chief Executive Officer | Transaction Bonus Plan ("Plan") |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of ownership interest in plan | 50.00% |  |  |  |  |  |
President and Chief Operating Officer Member | Transaction Bonus Plan ("Plan") |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of ownership interest in plan | 10.00% |  |  |  |  |  |
Other Key Employees [Member] | Transaction Bonus Plan ("Plan") |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of ownership interest in plan | 35.00% |  |  |  |  |  |
Consultants [Member] | Transaction Bonus Plan ("Plan") |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of ownership interest in plan | 6.00% |  |  |  |  |  |
Pearson Action |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Contingent severance obligation accrual |  |  |  |  |  |  | $ 2,000
Cost of Revenues |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Royalty expense |  | $ 524 | $ 470 | $ 1,369 | $ 1,664 |  |
Wireless Essential Patent Holders |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Royalty expire year |  |  |  | 2021 |  |  |
Wireless Essential Patent Holders | Maximum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Royalty payment percent of net revenues |  |  |  | 5.00% |  |  |
Other Providers of Integrated Technologies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Royalty expire year |  |  |  | 2026 |  |  |
Other Providers of Integrated Technologies | Maximum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Royalty payment percent of net revenues |  |  |  | 5.00% |  |  |

X
- Definition Percentage of consideration payable. + References No definition available. + Details
Name: | sonm_PercentageOfConsiderationPayable
Namespace Prefix: | sonm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of ownership interest in plan. + References No definition available. + Details
Name: | sonm_PercentageOfOwnershipInterestInPlan
Namespace Prefix: | sonm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Royalty expire year. + References No definition available. + Details
Name: | sonm_RoyaltyExpireYear
Namespace Prefix: | sonm_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Royalty payment percent of net revenues. + References No definition available. + Details
Name: | sonm_RoyaltyPaymentPercentOfNetRevenues
Namespace Prefix: | sonm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of plan. + References No definition available. + Details
Name: | sonm_TermOfPlan
Namespace Prefix: | sonm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expense for salary and wage arising from service rendered by officer. Excludes allocated cost, labor-related nonsalary expense, and direct and overhead labor cost included in cost of good and service sold. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_OfficersCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585 + Details
Name: | us-gaap_PaymentsForLegalSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_RoyaltyExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_PlanNameAxis=sonm_TransactionBonusPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=sonm_PresidentAndChiefOperatingOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=sonm_OtherKeyEmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=sonm_ConsultantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=sonm_PearsonActionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=sonm_WirelessEssentialPatentHoldersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=sonm_OtherProvidersOfIntegratedTechnologiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |