XML 55 R44.htm IDEA: XBRL DOCUMENT
v3.19.2

Commitments and Contingencies - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |  |  |
Severance obligation change in control period |  |  | 12 months |  |
Contingent severance obligation accrual | $ 0 |  | $ 0 |  | $ 0
Cost of Revenues |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Royalty expense | 1,247,000 | $ 619,000 | $ 1,698,000 | $ 1,029,000 |
Wireless Essential Patent Holders |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Royalty expire year |  |  | 2021 |  |
Other Providers of Integrated Technologies |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Royalty expire year |  |  | 2023 |  |
Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Severance obligation before change in control | 1,057,000 |  | $ 1,057,000 |  |
Severance obligation change in control | 1,407,000 |  | 1,407,000 |  |
Severance obligation in event of termination with cause | $ 88,000 |  | $ 88,000 |  |
Maximum | Wireless Essential Patent Holders |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Royalty payment percent of net revenues |  |  | 5.00% |  |
Maximum | Other Providers of Integrated Technologies |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Royalty payment percent of net revenues |  |  | 5.00% |  |

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: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Severance obligation before change in control + References No definition available. + Details
Name: | sonm_SeveranceObligationBeforeChangeInControl
Namespace Prefix: | sonm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Severance obligation change in control. + References No definition available. + Details
Name: | sonm_SeveranceObligationChangeInControl
Namespace Prefix: | sonm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Severance obligation change in control period. + References No definition available. + Details
Name: | sonm_SeveranceObligationChangeInControlPeriod
Namespace Prefix: | sonm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Severance obligation in event of termination. + References No definition available. + Details
Name: | sonm_SeveranceObligationInEventOfTermination
Namespace Prefix: | sonm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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=82911808&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 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=115205541&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_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_CounterpartyNameAxis=sonm_OtherProvidersOfIntegratedTechnologiesMember
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: |