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Revenue Recognition - Summary of Contract Balances (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
Balance at, January 1, 2021 | $ 5
Balance at, March 31, 2021 | 0
Contractual Liability |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |
Balance at, January 1, 2021 | 5
Recognition of revenue | $ (5)

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- Definition Contract with customer liability recognition of revenue. + References No definition available. + Details
Name: | sonm_ContractWithCustomerLiabilityRecognitionOfRevenue
Namespace Prefix: | sonm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ContractWithCustomerDurationAxis=sonm_ContractualLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |