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Warrants - Schedule of Warrants Issued and Outstanding (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Class Of Warrant Or Right [Line Items] |  |
Number of warrant shares | 29 | 956
Issuance Date, November 2012 Tranche One |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise price | $ 6.03 | $ 6.00
Number of warrant shares | 7 | 7
Year of expiration | 2028 | 2028
Issuance Date, November 2012 Tranche Two |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise price |  | $ 6.00
Number of warrant shares |  | 927
Year of expiration | 2020 | 2020
Issuance Date, November 2012 Tranche Three |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise price | $ 14.50 | $ 14.50
Number of warrant shares | 22 | 22
Year of expiration | 2028 | 2028

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- Definition Warrants expiration year. + References No definition available. + Details
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Namespace Prefix: | sonm_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
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
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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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- Details
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- Details
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